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Definition of Contractile vacuole
1. Noun. (context: cell biology) A vacuole that removes waste or excess water. ¹
¹ Source: wiktionary.com
Medical Definition of Contractile vacuole
1. A specialised vacuole of eukaryote cells, especially Protozoa, that fills with water from the cytoplasm and then discharges this externally by the opening of a permanent narrow neck. Function is probably osmoregulatory. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)