| 释义 |
re-ˈentrant, a. (and n.)
[f. re- + entrant. Cf. F. rentrant.]
A. adj.
1. a. = re-entering ppl. a. 1 and 1 b.
1781J. T. Dillon Trav. Spain 462 He could find nothing which seemed to confirm the opinion relating to the salient and reentrant angles. 1825J. Nicholson Operat. Mechanic 588 When the faces form a re-entrant angle, common dove-tailing is preferable. 1876Tait Rec. Adv. Phys. Sc. v. (ed. 2) 108 Any re-entrant line whatever may be supposed to be traced. 1883Harper's Mag. Nov. 887/1 The re-entrant angles of the splay. 1967M. Chandler Ceramics in Mod. World iv. 122 It is difficult to form reentrant shapes between two dies. 1973J. G. Tweeddale Materials Technol. II. iv. 94 There are limits on the shapes of the grooves in grooved rolls, re⁓entrant angles are completely unusable. 1975D. G. Fink Electronics Engineers' Handbk. ix. 49 Magnetron oscillators are single-port devices. Both the slow-wave circuit and the electron stream are reentrant; i.e., the circular geometry is always used.
b. Mus. Designating a form of tuning of the open strings of the citole, cittern, and ukulele, in which the fourth course is tuned to a higher pitch than the third, as e′, d′, g, b or e′, d′, g, a for the cittern.
1948Galpin Soc. Jrnl. I. 48 The cittern's curious re⁓entrant tuning gives simply-fingered versions of all the chords commonly used in contemporary music. 1961A. C. Baines Mus. Instruments vii. 166 Its [sc. the cittern's] tunings..were re-entrant, with the fourth course higher in pitch than the third, as on the modern ukelele. 1976D. Munrow Instruments Middle Ages & Renaissance iv. 27/1 The instrument which Tinctoris describes [c. 1487] is unquestionably the ancestor of the renaissance cittern, with..a re-entrant tuning for its four metal strings. Ibid., The earliest account of the tuning of any stringed instrument, that of Jerome of Moravia (c. 1250), described three fiddle tunings, one of which is re-entrant.
2. a. Of or pertaining to something which returns upon itself, as in Electr., applied to a form of armature winding (see quot. 1901); in Acoustics, applied to a form of horn loudspeaker in which the bore is divided and folded upon itself before expanding to the flare, in order to reduce space.
1901Sheldon & Mason Dynamo Electr. Machinery iii. 46 A singly-re-entrant winding is one in which, by successive angular advances, all the coils have been laid when an advance of 360° has been made. To be doubly-re-entrant wound the angular advance between successive coils, in the order of their winding, is doubled; and the whole winding is not complete until the armature has been gone around, angularly, twice, i.e., through an advance of 720°. 1902Jrnl. Inst. Electr. Engineers XXXI. iv. 933 A winding is re⁓entrant if it comes back to the starting point and is then complete. 1928Gramophone Jan. 345/1 There are now listed three models (called ‘re-entrant’) in which a relatively broad acoustic system is, by means of embodying a double reflexion of tone, enabled correctly to expand to quite a wide⁓mouthed horn in no greater depth from front to back than is allowable in the relatively shallow American pattern cabinet. 1940Chambers's Techn. Dict. 710/1 The majority of windings are singly re-entrant. 1960Practical Wireless XXXVI. 395/2 Speakers of the re-entrant type will be found most suitable. 1961Briggs & Cooke A to Z in Audio 79 One of the earliest applications of this principle [sc. that of the exponential horn] to sound reproduction was probably the re-entrant gramophone produced by HMV in 1927.
b. Computers. Of, pertaining to, or designating a program or subprogram which may be called or entered many times concurrently from one or several programs without alteration of the results obtained from any one execution.
1964Proc. Fall Joint Computer Conf. i. 45 (heading) Method of control for re-entrant programs. Ibid. 45/1 A routine which permits unlimited multiple entrances and executions before prior executions are complete is called a re-entrant routine. 1970O. Dopping Computers & Data Processing xiv. 221 A form of programming which allows re-entry into a partially used subroutine is called re-entrant programming. 1976H. D. Baecker in Virtual Storage (Infotech International Ltd.) 195 Allocation of and access to local variables in recursive or re-entrant environments. Ibid., Re-entrant programs are not only a good thing because of their alleged economy of space.
B. n.
a. Geogr. A prominent, angular indentation into a landform, such as an inlet between two coastal promontories or a valley extending into a hill or mountain side.
1893[see pocket-beach s.v. pocket n. 13]. 1899R. T. Hill Geol. Jamaica i. 18 The interior mountains are marked by deeply etched knife-edged salients..and angular re⁓entrants. 1936Bull. Amer. Assoc. Petroleum Geologists XX. 1224 The profound reëntrant between the escarpment of the Serra das Furnas and that of the Serra de São Jaoquim. 1962J. Onslow Bowler-Hatted Cowboy v. 53 Dense spruce spread from the valley upwards, following the big re⁓entrants. 1973C. Bonington Next Horizon xviii. 248 The road was like a switchback gone mad, as it bucked from valley floor, over spurs, round re-entrants and down again.
b. A re-entrant angle in a fortification.
1900‘Linesman’ Words by Eyewitness iii. (1902) 41 A..crackle of musketry from the occupants of the re-entrant. |