| 单词 | contractile vacuole |
| 释义 | contractile vacuole Cell Biol. a membrane-enveloped cellular organelle, found in many microorganisms, that periodically expands, filling with water, and then contracts, expelling its contents to the cell exterior: thought to be important in maintaining hydrostatic equilibrium. See diags. under ameba, paramecium. [1875-80] |
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