trapdoorn.

/ˈtrapˈdɔː/

Etymology: < trap n.¹ + door n.

a. A door, either sliding or moving on hinges, and flush with the surface, in a floor, roof, or ceiling, or in the stage of a theatre.

ΘΚΠ

society > inhabiting and dwelling > inhabited place > a building > parts of building > window or door > types of door > [noun] > trapdoor

trapc1374

trapdoorc1374

fall door1481

scuttle1707

c1374 G. Chaucer Troilus & Criseyde iii. 710 (759) ‘Which weye be ye comen..?’ Quod she... ‘Here at þis secre trappe dore’, quod he.

1489–90 in H. Littlehales Medieval Rec. London City Church (1905) 155 For viij ffoote di. tymber for o trapp dorr.

1579–80 T. North tr. Plutarch Lives (1595) 1092 Aristippus..locked himself..in a litle high chamber with a trappe dore, and set his bed vpon it, and so slept.

1599 E. Sandys Europæ Speculum (1632) 97 They have their trap doores or pit-falls in darke melancholy chambers.

1704 S. Sewall Diary 12 Sept. (1973) I. 513 Mrs. Tuthill falls through a Trap Door into the cellar.

1774 T. Pennant Tour Scotl. 1772 93 The trap-door in the floor, contrived for the lowering in of the captives.

1841 C. Dickens Old Curiosity Shop i. xxxv. 292 Getting on the roof of the house through the trap-door.

b. transferred and figurative.

ΘΚΠ

the world > action or operation > harm or detriment > danger > [noun] > instance or cause of > hidden

pitfallc1390

wevet1499

a pad in the straw1530

shelf1560

trapfall1596

snake1611

trapdoor1648

mantrap1798

death-trap1828

nigger in the woodpile1852

—— in the woodpile1857

1648 T. Gage Eng.-Amer. 82 Never to go to those parts, which were but snares and trap-dores to let down to hell.

1694 P. A. Motteux tr. F. Rabelais Pantagruel's Voy.: 4th Bk. Wks. iv. xxxiv. 136 It no more open'd its Guttural Trap-door.

1860 P. P. Carpenter in Rep. Smithsonian Inst. 1859 206 (note) The operculum is a horny or shelly appendage to the end of the foot... It may be called..the trap-door or toe-nail.

1869 J. Martineau Ess. Philos. & Theol. 2nd Ser. 94 The trap-door of some hidden paradox.

c. Mining. A door in a level for directing the ventilating current; a weather-door.

ΘΚΠ

society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > passage > ventilation passages or openings

througher1645

thirling1686

air-pit1709

horse-head1747

sollar1778

airway1800

wind-hole1802

bearing door1813

air course1814

downcast shaft1814

upcast shaft (or pit)1816

buze1823

air road1832

raggling1839

thirl1847

brattice1849

intake1849

run1849

trapdoor1849

skailing1850

return1851

wind-road1860

breakthrough1875

wind-way1875

breast1882

cross-heading1883

skail-door1883

U.C.1883

undercast1883

vent1886

furnace-drift1892

the world > matter > gas > air > fresh air > [noun] > supplying fresh air or ventilation > ventilator > ventilation opening or hole > in a mine

skail-doora1693

bearing door1813

trapdoor1849

skailing1850

weather-door1881

1849 G. C. Greenwell Gloss. Terms Coal Trade Northumberland & Durham 54 A little boy whose employment consists in opening and shutting a trap-door when required.

1883 W. S. Gresley Gloss. Terms Coal Mining Trap-door, a small door, kept locked, fixed in a stopping or bolt, for giving access to firemen and certain others to the return air-ways, dams, or other disused places in a mine.

1886 J. Barrowman Gloss. Sc. Mining Terms 68 Trap-door, a door in an underground road for directing the ventilating current.

d. Computing. A method of surreptitiously gaining unauthorized access to data belonging to other users of a computer.

ΘΚΠ

society > computing and information technology > data > database > [noun] > access or retrieval > unauthorized access

trapdoor1977

1976 D. B. Parker Crime by Computer xii. 112 The Trojan horse had been rolled into the fortified city and fully accepted. In the unsuspecting environment a trap~door in its belly opened, and out popped the soldiers.]

1977 New Yorker 29 Aug. 61/1 The nature of a trapdoor is that, while it is known to and usable by a penetrator, it is unrecognized by and unknown to other users of the system—even to the audit-trail mechanism.

1981 Courier-Mail (Brisbane) 27 July 5/5 ‘Trapdoors’ allow people sharing a computer to slip into the confidential data streams of other users.

1982 S. F. X. Dean Such Pretty Toys xiv. 191 He just entered the girl's name into the computer..as some sort of routing key or trapdoor to cut off any trace.

e. Cryptography. A piece of secret information that makes it easy to solve an otherwise very difficult code. Frequently attributive.

ΘΚΠ

the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > decoding, deciphering > [noun] > aid to

trapdoor1978

1978 Communications ACM 21 128 They are called ‘trap-door’ functions since the inverse functions are in fact easy to compute once certain private ‘trap-door’ information is known.

1982 H. Beker & F. Piper Cipher Syst. 376 The general name given to this type of function (i.e. for which there does not appear to be a polynomial time algorithm but for which there is one so long as the method of application is known) is a trapdoor function. In our situation it is intended that the genuine receiver should be the only person who knows how to ‘open’ the trapdoor.

1984 IEEE Trans. Information Theory XXX. 595/1 It is this presence of trapdoors that makes some of the attacks on the additive knapsack cryptosystems feasible.

Compounds

trapdoor spider n. one of a group of large spiders, which make a nest in the shape of a tube with a hinged lid which opens and shuts like a trapdoor; hence trapdoor nest, etc.

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > class Arachnida > [noun] > order Aranea > division Tetrapneumones > family Mygalidae > member of

mason spider1826

trapdoor spider1826

1826 W. Kirby & W. Spence Introd. Entomol. III. xxxiv. 492 The trapdoor or mason spider (Mygale cœmentaria).

1864–5 J. G. Wood Homes without Hands (1868) vi. 116 Of all the burrowing spiders..none is so admirable an excavator as the Trap-door Spider of Jamaica [Cteniza].

1883 Pall Mall Gaz. 29 Dec. 5/1 The trap-door spider is almost the typical natural curiosity of the Riviera.

1897 A. Page Afternoon Ride 58 The..spider, decoyed out of his well-built trap-door nest.

This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2021).

单词	trapdoor
释义	trapdoorn. /ˈtrapˈdɔː/ Etymology: < trap n.¹ + door n. a. A door, either sliding or moving on hinges, and flush with the surface, in a floor, roof, or ceiling, or in the stage of a theatre. ΘΚΠ society > inhabiting and dwelling > inhabited place > a building > parts of building > window or door > types of door > [noun] > trapdoor trapc1374 trapdoorc1374 fall door1481 scuttle1707 c1374 G. Chaucer Troilus & Criseyde iii. 710 (759) ‘Which weye be ye comen..?’ Quod she... ‘Here at þis secre trappe dore’, quod he. 1489–90 in H. Littlehales Medieval Rec. London City Church (1905) 155 For viij ffoote di. tymber for o trapp dorr. 1579–80 T. North tr. Plutarch Lives (1595) 1092 Aristippus..locked himself..in a litle high chamber with a trappe dore, and set his bed vpon it, and so slept. 1599 E. Sandys Europæ Speculum (1632) 97 They have their trap doores or pit-falls in darke melancholy chambers. 1704 S. Sewall Diary 12 Sept. (1973) I. 513 Mrs. Tuthill falls through a Trap Door into the cellar. 1774 T. Pennant Tour Scotl. 1772 93 The trap-door in the floor, contrived for the lowering in of the captives. 1841 C. Dickens Old Curiosity Shop i. xxxv. 292 Getting on the roof of the house through the trap-door. b. transferred and figurative. ΘΚΠ the world > action or operation > harm or detriment > danger > [noun] > instance or cause of > hidden pitfallc1390 wevet1499 a pad in the straw1530 shelf1560 trapfall1596 snake1611 trapdoor1648 mantrap1798 death-trap1828 nigger in the woodpile1852 —— in the woodpile1857 1648 T. Gage Eng.-Amer. 82 Never to go to those parts, which were but snares and trap-dores to let down to hell. 1694 P. A. Motteux tr. F. Rabelais Pantagruel's Voy.: 4th Bk. Wks. iv. xxxiv. 136 It no more open'd its Guttural Trap-door. 1860 P. P. Carpenter in Rep. Smithsonian Inst. 1859 206 (note) The operculum is a horny or shelly appendage to the end of the foot... It may be called..the trap-door or toe-nail. 1869 J. Martineau Ess. Philos. & Theol. 2nd Ser. 94 The trap-door of some hidden paradox. c. Mining. A door in a level for directing the ventilating current; a weather-door. ΘΚΠ society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > passage > ventilation passages or openings througher1645 thirling1686 air-pit1709 horse-head1747 sollar1778 airway1800 wind-hole1802 bearing door1813 air course1814 downcast shaft1814 upcast shaft (or pit)1816 buze1823 air road1832 raggling1839 thirl1847 brattice1849 intake1849 run1849 trapdoor1849 skailing1850 return1851 wind-road1860 breakthrough1875 wind-way1875 breast1882 cross-heading1883 skail-door1883 U.C.1883 undercast1883 vent1886 furnace-drift1892 the world > matter > gas > air > fresh air > [noun] > supplying fresh air or ventilation > ventilator > ventilation opening or hole > in a mine skail-doora1693 bearing door1813 trapdoor1849 skailing1850 weather-door1881 1849 G. C. Greenwell Gloss. Terms Coal Trade Northumberland & Durham 54 A little boy whose employment consists in opening and shutting a trap-door when required. 1883 W. S. Gresley Gloss. Terms Coal Mining Trap-door, a small door, kept locked, fixed in a stopping or bolt, for giving access to firemen and certain others to the return air-ways, dams, or other disused places in a mine. 1886 J. Barrowman Gloss. Sc. Mining Terms 68 Trap-door, a door in an underground road for directing the ventilating current. d. Computing. A method of surreptitiously gaining unauthorized access to data belonging to other users of a computer. ΘΚΠ society > computing and information technology > data > database > [noun] > access or retrieval > unauthorized access trapdoor1977 1976 D. B. Parker Crime by Computer xii. 112 The Trojan horse had been rolled into the fortified city and fully accepted. In the unsuspecting environment a trap~door in its belly opened, and out popped the soldiers.] 1977 New Yorker 29 Aug. 61/1 The nature of a trapdoor is that, while it is known to and usable by a penetrator, it is unrecognized by and unknown to other users of the system—even to the audit-trail mechanism. 1981 Courier-Mail (Brisbane) 27 July 5/5 ‘Trapdoors’ allow people sharing a computer to slip into the confidential data streams of other users. 1982 S. F. X. Dean Such Pretty Toys xiv. 191 He just entered the girl's name into the computer..as some sort of routing key or trapdoor to cut off any trace. e. Cryptography. A piece of secret information that makes it easy to solve an otherwise very difficult code. Frequently attributive. ΘΚΠ the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > decoding, deciphering > [noun] > aid to trapdoor1978 1978 Communications ACM 21 128 They are called ‘trap-door’ functions since the inverse functions are in fact easy to compute once certain private ‘trap-door’ information is known. 1982 H. Beker & F. Piper Cipher Syst. 376 The general name given to this type of function (i.e. for which there does not appear to be a polynomial time algorithm but for which there is one so long as the method of application is known) is a trapdoor function. In our situation it is intended that the genuine receiver should be the only person who knows how to ‘open’ the trapdoor. 1984 IEEE Trans. Information Theory XXX. 595/1 It is this presence of trapdoors that makes some of the attacks on the additive knapsack cryptosystems feasible. Compounds trapdoor spider n. one of a group of large spiders, which make a nest in the shape of a tube with a hinged lid which opens and shuts like a trapdoor; hence trapdoor nest, etc. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > class Arachnida > [noun] > order Aranea > division Tetrapneumones > family Mygalidae > member of mason spider1826 trapdoor spider1826 1826 W. Kirby & W. Spence Introd. Entomol. III. xxxiv. 492 The trapdoor or mason spider (Mygale cœmentaria). 1864–5 J. G. Wood Homes without Hands (1868) vi. 116 Of all the burrowing spiders..none is so admirable an excavator as the Trap-door Spider of Jamaica [Cteniza]. 1883 Pall Mall Gaz. 29 Dec. 5/1 The trap-door spider is almost the typical natural curiosity of the Riviera. 1897 A. Page Afternoon Ride 58 The..spider, decoyed out of his well-built trap-door nest. This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2021). < n.c1374
随便看	nondurables none none end none man none mans land none of none of your etc funeral none of your funeral none of your our funeral none other boot none otherwise none so deaf as those who won't hear none so dusty none such none the wiser none too none-bell none-gate none-gates none-kin none-kins none-so-pretties none-so-pretty none-so-pretty tape nose to tail