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contractile vacuole

noun, Cell Biology.
1.
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.
Origin of contractile vacuole
1875-1880
First recorded in 1875-80
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Based on the Random House Dictionary, © Random House, Inc. 2018.
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