| 释义 |
exudation|ɛksjuːˈdeɪʃən|
Also 7–8 exsudation.
[ad. late L. ex(s)ūdātiōn-em, n. of action f. ex(s)ūdāre to exude.]
1. a. The process of exuding; the giving off or oozing out (of moisture) in the manner of sweat.
1612Woodall Surg. Mate Wks. (1653) 95 In these wounds..appear exudations of clammy humours. 1668Phil. Trans. III. 855 A purer sort of Opium, taken from the Husks of Poppy-seed, being prickt, after some time of exsudation and insolation. 1713Derham Phys. Theol. 64 foot-n., An Exsudation..of some petrifying Juices out of the rocky Earth. 1794G. Adams Nat. & Exp. Philos. II. xiii. 15 Any exudation of the wine through the pores of the bottles. 1862G. P. Scrope Volcanos (ed. 2) 37 The vapour it once contained escaped..by exudation through extremely minute pores. 1866Tate Brit. Mollusks iv. 88 The Testacella form a kind of cocoon in the ground by the exudation of mucus.
attrib.1845–6G. E. Day tr. Simon's Anim. Chem. II. 499 Exudation-corpuscles. 1852–9Todd Cycl. Anat. IV. 119/2 Exudation-Products exhibit themselves in the form of Compound-granule corpuscles. 1882Geikie Text-bk. Geol. ii. ii. §3. 90 ‘Segregation’ or ‘exudation’ veins.
¶b. Incorrectly: Percolation, trickling through; ? slow and gradual overflow. Cf. exude 1 b.
1793Smeaton Edystone L. §302 The least exudation of moisture down into the rooms. 1856Kane Arct. Expl. I. Notes 460 Looking upon the glaciers of Greenland as canals of exudation.
c. Metallurgy. (See quot. 1958). Also attrib.
1945Jrnl. Iron & Steel Inst. CLI. 283 A reliable method of determining the extent of lead segregation in a sample of leaded steel is by means of the ‘exudation test’. Ibid., If segregated lead is present, this treatment results in the exudation of the lead on the surface in the form of globules. 1958A. D. Merriman Dict. Metallurgy 87/2 Exudation, the phenomenon in which the liquid produced by partial or complete melting of a solid is liberated and escapes. It is commonly applied to the liberation of liquid metal from the solid, as in the case of the production of molten lead from a leaded brass on heating at temperatures in excess of the melting point of lead.
2. concr. Something which is exuded.
1626Bacon Sylva §4 Rock Rubies are the fine Exudations of Stone. 1744Berkeley Siris §11 Resinous exsudations of pines and firs. 1875H. C. Wood Therap. (1879) 391 Calomel should not be used..where the exudation is serous.
fig.1883Fortn. Rev. Feb. 197 Malice is a natural exudation in every mind. |