semipermeableadj.

Etymology: translating German halbdurchlässig (J. H. van't Hoff 1887, in Zeitschr. f. physik. Chem. I. 482), < halb- half n., semi- + durchlässig pervious, permeable.Previous versions of the OED give the stress as: semiˈpermeable.

Of a membrane or other structure: selectively permeable to certain atoms and molecules; spec. permeable to molecules of water but not to those of any dissolved substance. Also in extended use.

ΚΠ

1888 W. Ramsay tr. J. van't Hoff in London, Edinb. & Dublin Philos. Mag. 5th Ser. 26 82 The porous membrane..will be termed in the following pages a ‘semipermeable membrane’.

1895 W. C. D. Whetham Solution & Electrolysis iv. 34 These semi~permeable membranes are made by filling a porous pot with the solution of a salt such as potassium ferro~cyanide, and surrounding the outside with another solution..which gives an insoluble precipitate when in contact with the first.

1930 Engineering 28 Nov. 670/1 Each droplet [of sap] being subject to forces equivalent to the osmotic pressure acting on a plant cell within a semi~permeable membrane.

1974 L. Thomas Lives of Cell (1975) 162 I am glad to have a semipermeable memory after getting into this.

1978 P. W. Atkins Physical Chem. viii. 222 The chemical potential of the solvent on both sides of the semipermeable membrane must be equal.

Derivatives

ˌsemipermeaˈbility n. the property or condition of being semipermeable.

ΘΚΠ

the world > movement > motion in a certain direction > movement over, across, through, or past > [noun] > through any medium or space > permeation > ability to be permeated > property of being semipermeable

semipermeability1900

1900 W. H. Howell Text-bk. Physiol. (ed. 2) I. ii. 66 The semi-permeability is only approximately complete.

1974 L. Thomas Lives of Cell (1975) 173 Oxygen filters out the very bands of ultraviolet light that are most devastating for nucleic acids and proteins, while allowing full penetration of the visible light needed for photosynthesis. If it had not been for this semipermeability, we could never have come along.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2019).

单词	semipermeable
释义	semipermeableadj. Etymology: translating German halbdurchlässig (J. H. van't Hoff 1887, in Zeitschr. f. physik. Chem. I. 482), < halb- half n., semi- + durchlässig pervious, permeable.Previous versions of the OED give the stress as: semiˈpermeable. Of a membrane or other structure: selectively permeable to certain atoms and molecules; spec. permeable to molecules of water but not to those of any dissolved substance. Also in extended use. ΚΠ 1888 W. Ramsay tr. J. van't Hoff in London, Edinb. & Dublin Philos. Mag. 5th Ser. 26 82 The porous membrane..will be termed in the following pages a ‘semipermeable membrane’. 1895 W. C. D. Whetham Solution & Electrolysis iv. 34 These semi~permeable membranes are made by filling a porous pot with the solution of a salt such as potassium ferro~cyanide, and surrounding the outside with another solution..which gives an insoluble precipitate when in contact with the first. 1930 Engineering 28 Nov. 670/1 Each droplet [of sap] being subject to forces equivalent to the osmotic pressure acting on a plant cell within a semi~permeable membrane. 1974 L. Thomas Lives of Cell (1975) 162 I am glad to have a semipermeable memory after getting into this. 1978 P. W. Atkins Physical Chem. viii. 222 The chemical potential of the solvent on both sides of the semipermeable membrane must be equal. Derivatives ˌsemipermeaˈbility n. the property or condition of being semipermeable. ΘΚΠ the world > movement > motion in a certain direction > movement over, across, through, or past > [noun] > through any medium or space > permeation > ability to be permeated > property of being semipermeable semipermeability1900 1900 W. H. Howell Text-bk. Physiol. (ed. 2) I. ii. 66 The semi-permeability is only approximately complete. 1974 L. Thomas Lives of Cell (1975) 173 Oxygen filters out the very bands of ultraviolet light that are most devastating for nucleic acids and proteins, while allowing full penetration of the visible light needed for photosynthesis. If it had not been for this semipermeability, we could never have come along. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2019). > as lemmas semi-permeable semi-permeable adj. Brit. /ˌsɛmɪˈpəːmɪəbl/ , U.S. /ˌsɛˌmaɪˈpərmiəb(ə)l/ , /ˌsɛmiˈpərmiəb(ə)l/ ΚΠ 1900 W. Ramsay in Smithsonian Rep. 253 A vessel the walls of which are permeable to the solvent, but not to the dissolved substance (‘semipermeable membrane’). extracted from semi-prefix < adj.1888 as lemmas
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semipermeableadj.

Derivatives

> as lemmas