scavengingn.

/ˈskavəndʒɪŋ/

Etymology: < scavenge v. + -ing suffix¹.

1. Street-cleaning; removal of filth; also, the cleaning of a river, etc.

ΘΚΠ

the world > physical sensation > cleanness and dirtiness > cleaning > cleaning streets > [noun]

scavage1547

scavengery1656

scavengering1841

scavagery1851

scavenging1851

scavenage1878

scavenge1912

the world > physical sensation > cleanness and dirtiness > clearing of refuse matter > [noun] > clearing of stream or channel

scouring1458

roding1664

scavenging1883

1851 H. Mayhew London Labour II. 208/1 The private scavenging of the metropolitan mews.

1883 Summary 26 July 6/4 He considers..that nothing short of a daily scavenging [of the Regent's Canal] will be satisfactory.

in extended use.1862 Sat. Rev. 13 618/2 He was accustomed to cut a number of sermons out of the volumes in order to carry on his scavenging in his own garret.

a. Removal of combustion products from the cylinders of internal-combustion engines. Also as participial adj.

ΘΚΠ

society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [noun] > removal or expulsion of products or deposits

scavenging1894

exhaust1896

decarbonization1912

scavenge1912

decoke1962

society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [adjective] > removing deposits

scavenging1894

scavenge1912

uniflow1949

1894 Work 17 Feb. 73/3 Questions such as late ignitions, scavenging, varying explosive charges [etc.].

1896 B. Donkin Text-bk. Gas, Oil, & Air Engines (ed. 2) i. xix. 269 The increase in economy obtained with the new (1894) ‘scavenging’ Crossley-Atkinson engine.

1896 B. Donkin Gas, Oil, & Air Engines (ed. 2) i. xix. 269 The success obtained in the new ‘scavenging’ motor.

1899 J. Perry Steam Engine 452 The shapes of the passages and piston end, &c., which facilitate this scavenging action.

1899 J. Perry Steam Engine 452 Scavenging is effected in the Wells (Premier) engine by pumping air into the cylinder.

1902 Encycl. Brit. XXVIII. 607/2 The removal or scavenging of all products of combustion from the compression space in the cylinder.

1902 Encycl. Brit. XXVIII. 607/2 Scavenging reduces the risk of the explosive mixture being fired prematurely.

1902 Encycl. Brit. XXVIII. 607/2 After a misfire in a non-scavenging engine of a large size the explosive force is excessive, and has to be provided for by specially strengthening the engine. With a scavenging engine this trouble is avoided.

1903 Amer. Inventor 15 Aug. 78 In all engines employing the two-stroke cycle, scavenging must be accomplished either by special piston movement or by a blast of air from an auxiliary pump, directed in such a manner as to force out the remaining burned gases.

1915 Illustr. London News 13 Mar. 340 Scavenging-pump for expelling used gases at the end of each stroke.

1924 Times Trade & Engin. Suppl. 29 Nov. 250/3 As is usual with large Sulzer engines the scavenging air is supplied from electrically driven turbo blowers installed in the engine-room.

1954 E. J. Kates Diesel & High-compression Gas Engines ii. 24 Instead of rotary blowers, many two-cycle diesels employ what is called crankcase-scavenging.

1954 E. J. Kates Diesel & High-compression Gas Engines ii. 25 The outside atmospheric pressure then pushed open the scavenging valve and permitted a fresh supply of air to enter the crankcase.

1962 J. M. Doherty Diesel Locomotive Pract. ii. 25 To obtain efficient scavenging in two-stroke engines, the air is always admitted to the cylinder under pressure.

1975 M. J. Nunney Automotive Engine x. 248 The mean effective pressures developed by a two-stroke engine..depend upon its scavenging efficiency.

b. Chemistry. The action of scavenge v. 4b.

ΘΚΠ

the world > matter > chemistry > chemical properties > [noun] > combining with or removing free radicals, etc.

scavenging1955

1955 Jrnl. Amer. Chem. Soc. 77 3245/2 There must be two reactions which produce the dinitrile, one which is subject to scavenging by the mercaptan and one which is not.

1978 Nature 1 June 374/1 Lal et al. have shown that from 12 to 15% of dissolved silicate can be removed from seawater by scavenging during precipitation of finely dispersed ferric hydroxide.

This entry has not yet been fully updated (first published 1910; most recently modified version published online March 2021).

单词	scavenging
释义	scavengingn. /ˈskavəndʒɪŋ/ Etymology: < scavenge v. + -ing suffix¹. 1. Street-cleaning; removal of filth; also, the cleaning of a river, etc. ΘΚΠ the world > physical sensation > cleanness and dirtiness > cleaning > cleaning streets > [noun] scavage1547 scavengery1656 scavengering1841 scavagery1851 scavenging1851 scavenage1878 scavenge1912 the world > physical sensation > cleanness and dirtiness > clearing of refuse matter > [noun] > clearing of stream or channel scouring1458 roding1664 scavenging1883 1851 H. Mayhew London Labour II. 208/1 The private scavenging of the metropolitan mews. 1883 Summary 26 July 6/4 He considers..that nothing short of a daily scavenging [of the Regent's Canal] will be satisfactory. in extended use.1862 Sat. Rev. 13 618/2 He was accustomed to cut a number of sermons out of the volumes in order to carry on his scavenging in his own garret. 2. a. Removal of combustion products from the cylinders of internal-combustion engines. Also as participial adj. ΘΚΠ society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [noun] > removal or expulsion of products or deposits scavenging1894 exhaust1896 decarbonization1912 scavenge1912 decoke1962 society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [adjective] > removing deposits scavenging1894 scavenge1912 uniflow1949 1894 Work 17 Feb. 73/3 Questions such as late ignitions, scavenging, varying explosive charges [etc.]. 1896 B. Donkin Text-bk. Gas, Oil, & Air Engines (ed. 2) i. xix. 269 The increase in economy obtained with the new (1894) ‘scavenging’ Crossley-Atkinson engine. 1896 B. Donkin Gas, Oil, & Air Engines (ed. 2) i. xix. 269 The success obtained in the new ‘scavenging’ motor. 1899 J. Perry Steam Engine 452 The shapes of the passages and piston end, &c., which facilitate this scavenging action. 1899 J. Perry Steam Engine 452 Scavenging is effected in the Wells (Premier) engine by pumping air into the cylinder. 1902 Encycl. Brit. XXVIII. 607/2 The removal or scavenging of all products of combustion from the compression space in the cylinder. 1902 Encycl. Brit. XXVIII. 607/2 Scavenging reduces the risk of the explosive mixture being fired prematurely. 1902 Encycl. Brit. XXVIII. 607/2 After a misfire in a non-scavenging engine of a large size the explosive force is excessive, and has to be provided for by specially strengthening the engine. With a scavenging engine this trouble is avoided. 1903 Amer. Inventor 15 Aug. 78 In all engines employing the two-stroke cycle, scavenging must be accomplished either by special piston movement or by a blast of air from an auxiliary pump, directed in such a manner as to force out the remaining burned gases. 1915 Illustr. London News 13 Mar. 340 Scavenging-pump for expelling used gases at the end of each stroke. 1924 Times Trade & Engin. Suppl. 29 Nov. 250/3 As is usual with large Sulzer engines the scavenging air is supplied from electrically driven turbo blowers installed in the engine-room. 1954 E. J. Kates Diesel & High-compression Gas Engines ii. 24 Instead of rotary blowers, many two-cycle diesels employ what is called crankcase-scavenging. 1954 E. J. Kates Diesel & High-compression Gas Engines ii. 25 The outside atmospheric pressure then pushed open the scavenging valve and permitted a fresh supply of air to enter the crankcase. 1962 J. M. Doherty Diesel Locomotive Pract. ii. 25 To obtain efficient scavenging in two-stroke engines, the air is always admitted to the cylinder under pressure. 1975 M. J. Nunney Automotive Engine x. 248 The mean effective pressures developed by a two-stroke engine..depend upon its scavenging efficiency. b. Chemistry. The action of scavenge v. 4b. ΘΚΠ the world > matter > chemistry > chemical properties > [noun] > combining with or removing free radicals, etc. scavenging1955 1955 Jrnl. Amer. Chem. Soc. 77 3245/2 There must be two reactions which produce the dinitrile, one which is subject to scavenging by the mercaptan and one which is not. 1978 Nature 1 June 374/1 Lal et al. have shown that from 12 to 15% of dissolved silicate can be removed from seawater by scavenging during precipitation of finely dispersed ferric hydroxide. This entry has not yet been fully updated (first published 1910; most recently modified version published online March 2021). < n.1851
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