| 释义 |
secretion|sɪˈkriːʃən|
[a. F. sécrétion, ad. L. sēcrētiōn-em, n. of action f. sēcernĕre to separate, secrete: see secern v. Cf. Sp. secrecion, Pg. secreção, It. secrezione.]
1. Phys. In an animal or vegetable body, the action of a gland or some analogous organ in extracting certain matters from the blood or sap and elaborating from them a particular substance, either to fulfil some function within the body or to undergo excretion as waste.
1646Sir T. Browne Pseud. Ep. iii. xiii. 137 It cannot bee called their urine; not onely because they want those parts of secretion; but because it is emitted aversly or backward, by both sexes. 1704J. Harris Lex. Techn. I, Secretion, is the separation of one Fluid from another in the Body of an Animal or Vegetable, by the means of Glands or something analogous to them. 1717P. Blair Misc. Observ. (1718) 12 Its being converted into Chyle and under-going the several Secretions throughout the Body. 1839Lindley Introd. Bot. ii. xii. (ed. 3) 372 Of Digestion, Respiration, and Secretion. 1878Bell tr. Gegenbaur's Comp. Anat. 18 This process of secretion varies in character.
attrib.1880Bessey Bot. 128 Intercellular spaces and secretion reservoirs. 1897Allbutt's Syst. Med. IV. 34 Naunyn..concludes then, that the cholesterin of the bile is neither a product of general metabolism nor a specific secretion product of the liver.
2. concr. That which is produced by the action of a secreting organ.
1732Arbuthnot Aliments, Rules of Diet 271 The Blood may be cleansed..perhaps better by Urine than any other Secretion. 1826Henry Elem. Chem. II. 433 The solids and fluids, thus produced, are sometimes elaborated by complicated organs called glands, and are then termed secretions. 1832Lindley Introd. Bot. 222 A passage through which the peculiar secretions may, when elaborated, arrive at the stations where they are finally to be deposited. 1865Tylor Early Hist. Man. vii. 177 The milky secretion from a small frog or toad. 1882Vines tr. Sachs' Bot. 568 When pollination takes place it [the Stigma] is covered with a viscid secretion.
b. transf. and fig.
1727Pope, etc. Art of Sinking iii. 12 Poetry is a natural or morbid Secretion from the Brain. 1822Lamb Elia Ser. i. Praise of Chimney-Sweepers, So may thy culinary fires, eased of the o'ercharged secretions from thy worse-placed hospitalities, curl up a lighter volume to the welkin. 1873Spencer Stud. Sociol. vi. 139 There have come down to us, from a long extinct race of men, those actual secretions of their daily life, which furnish colouring matter for a picture of them.
†3. In etymological sense:
a. Separation.
b. Philos. (= Gr. ἀπόκρισις.) Giving off of particles.
1696Brookhouse Temple Open. 58 The Extrusion of the Poor Reffugies was only an Act of Secretion By Him who has his Fan in his hand, who..dispersed them abroad, not for their Ruine but their Safety. 1678Cudworth Intell. Syst. i. i. §5. 8 Generation and Corruption may be sufficiently explained by Concretion and Secretion, or Local Motion, without Substantial Forms and Qualities.
4. Geol. (See quot.)
1882Geikie Text-bk. Geol. ii. ii. iv. (1885) 96 In a true concretion, the material at the centre has been deposited first, and has increased by additions from without... Where, on the other hand, cavities..have been filled up by the deposition of materials on their walls, and gradual growth inward, the result is known as a secretion.
Hence seˈcretional, seˈcretionary adjs., pertaining to secretion.
1877Bennett Thomé's Bot. 224 But diseases are also caused through the influence of the soil, depending on an abnormal transformation of those substances out of which the tissue of the plant is constructed. These constitute what are called secretional diseases. 1888Teall Brit. Petrogr. 447 Secretionary, a term used to express a growth from without inwards, in contradistinction to concretionary. |