impermeantadj.

Brit.

/ɪmˈpəːmɪənt/, U.S.

/ᵻmˈpərmiənt/

Origin: Formed within English, by derivation; modelled on a French lexical item. Etymons: im- prefix², permeant adj.

Etymology: < im- prefix² + permeant adj., after French imperméant ( L. Errera Cours de physiol. moléculaire (1907) 91). Compare later permeant adj. 3.

Chiefly Physiology.

Of a molecule or ion: unable to pass through a membrane (esp. a cell membrane).

ΚΠ

1935 Trans. Faraday Soc. 31 107 This electrolyte being identical with the first except that both its ions are impermeant to a second membrane through which the solutions may be connected.

1952 Symp. Phosphorus Metabolism II. 757 ATP and CrP [= C-reactive protein]..were unable to leave the cell, and thus behaved as impermeant ions on one side of a semipermeable membrane.

2004 T. A. Churchill in K. B. Storey Functional Metabolism xix. 531/2 In an environment of low temperature and low ATP, cellular edema is unavoidable unless an impermeant molecule (e.g., dextran, starch, albumin, or selected impermeant sugars) is introduced into the extracellular milieu.

This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022).

单词	impermeant
释义	impermeantadj. Brit. /ɪmˈpəːmɪənt/, U.S. /ᵻmˈpərmiənt/ Origin: Formed within English, by derivation; modelled on a French lexical item. Etymons: im- prefix², permeant adj. Etymology: < im- prefix² + permeant adj., after French imperméant ( L. Errera Cours de physiol. moléculaire (1907) 91). Compare later permeant adj. 3. Chiefly Physiology. Of a molecule or ion: unable to pass through a membrane (esp. a cell membrane). ΚΠ 1935 Trans. Faraday Soc. 31 107 This electrolyte being identical with the first except that both its ions are impermeant to a second membrane through which the solutions may be connected. 1952 Symp. Phosphorus Metabolism II. 757 ATP and CrP [= C-reactive protein]..were unable to leave the cell, and thus behaved as impermeant ions on one side of a semipermeable membrane. 2004 T. A. Churchill in K. B. Storey Functional Metabolism xix. 531/2 In an environment of low temperature and low ATP, cellular edema is unavoidable unless an impermeant molecule (e.g., dextran, starch, albumin, or selected impermeant sugars) is introduced into the extracellular milieu. This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022). < adj.1935
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