American Heritage® Dictionary of the English Language, Fourth Edition
- n. A basal body in certain flagellated protozoans that consists of a minute mass of chromatin embedded in the cytoplasm at the base of the flagellum.
Century Dictionary and Cyclopedia
- n. A specialized cilia-forming protoplasmic organ of the sperm-cells of certain plants. It first appears in the spermatozoid mother-cells in the form of a round body with radiating rays of kinoplasm, and through its growth and development gives rise to the motile cilia of the spermatozoids. The organ resembles a centrosome or centrosphere, and may be a modified homologue of that organ of the cell. In Zamia, Cycas, Ginkgo, and certain ferns, two of these organs appear in each spermatozoid mother-cell, one going to each of the two spermatozoids formed therefrom.
H. J. Webber, Development of the Antherozoids of Zamia, in Bot. Gazette, July 16, 1897, p. 24.
- n. In protozoans, a minute granule, of unknown function, at the base of each flagellum, as in Multicilia.
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