Also 7–8 exsudation. [ad. late L. ex(s)ūdātiōn-em, n. of action f. ex(s)ūdāre to EXUDE.]
1. The process of exuding; the giving off or oozing out (of moisture) in the manner of sweat.
1612. Woodall, Surg. Mate, Wks. (1653), 95. In these wounds often appear exudations of clammy humours.
1668. Phil. Trans., III. 855. A purer sort of Opium, taken from the Husks of Poppy-seed, being prickt, after some time of exsudation and insolation.
1713. Derham, Phys. Theol., 64, foot-n. An Exsudation … of some petrifying Juices out of the rocky Earth.
1794. G. Adams, Nat. & Exp. Philos., II. xiii. 15. Any exudation of the wine through the pores of the bottles.
1862. G. P. Scrope, Volcanos (ed. 2), 37. The vapour it once contained escaped … by exudation through extremely minute pores.
1866. Tate, Brit. Mollusks, iv. 88–9. The Testacellæ … ‘form a kind of cocoon in the ground by the exudation of mucus.’…—Woodward.
attrib. 1845–6. G. E. Day, trans. Simon’s Anim. Chem., II. 499. Exudation-corpuscles.
1852–9. Todd, Cycl. Anat., IV. 119/2. Exudation-Products exhibit themselves in the form of Compound-granule corpuscles.
1882. Geikie, Text-bk. Geol., II. II. § 3. 90. ‘Segregation’ or ‘exudation’ veins.
¶ b. Incorrectly: Percolation, trickling through; ? slow and gradual overflow. Cf. EXUDE 1 b.
1793. Smeaton, Edystone L., § 302. The least exudation of moisture down into the rooms.
1856. Kane, Arct. Expl., I. Notes 460. Looking upon the glaciers of Greenland as canals of exudation.
2. concr. Something that is exuded.
1626. Bacon, Sylva, § 4. Rock Rubies are the fine Exudations of Stone.
1744. Berkeley, Siris, § 11. 7. Resinous exsudations of pines and firs.
1875. H. C. Wood, Therap. (1879), 391. Calomel should not be used … where the exudation is serous.
fig. 1883. Fortn. Rev., Feb., 197. Malice is a natural exudation in every mind.
