CONTRACTILE VACUOLE
\kəntɹˈakta͡ɪl vˈakjuːˌə͡ʊl], \kəntɹˈaktaɪl vˈakjuːˌəʊl], \k_ə_n_t_ɹ_ˈa_k_t_aɪ_l v_ˈa_k_j_uː_ˌəʊ_l]\
Definitions of CONTRACTILE VACUOLE
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A small spherical vesicle, found in the cytoplasm of many Protista, which appears and disappears with regularity.
By Henderson, I. F.; Henderson, W. D.
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A v. observed in a structureless mass of protoplasm (as in the Endoplastica) which slowly fills with a watery fluid and, after reaching a certain size, contracts to obliteration, the process of distention and contraction being repeated rhythmically, after the manner of a systole and diastole.
By Smith Ely Jelliffe
