| plasmolysis | <plant biology> Process by which the plant cell protoplast shrinks, so that the plasma membrane becomes partly detached from the wall. Occurs in solutions of high osmotic potential, due to water moving out of the protoplast by osmosis. (31 Dec 1997) |
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| concave | Having a depressed or hollowed surface. Origin: L. Concavus, arched or vaulted (05 Mar 2000) |
| concave lens | A diverging minus power lens. Synonym: minus lens. (05 Mar 2000) |
| concave mirror | A spherical reflecting surface that constitutes a segment of the interior of a sphere. (05 Mar 2000) |
| double concave lens | A lens that is concave on two opposing surfaces. Synonym: concavoconcave lens, double concave lens. (05 Mar 2000) |