combining form of Gr. κύτος hollow, receptacle, etc., taken in modern formations with the meaning ‘cell’ (cf. -CYTE), and used in many biological terms: as CYTOBLAST, etc.: see below. Cytococcus [Gr. κόκκος berry], Haeckel’s term for the nucleus of a Cytula or impregnated ovum. Cytogenesis, the generation or production of cells; Cytogenetic a., pertaining to cytogenesis; Cytogenic, Cytogenous adjs., producing cells, or characterized by the formation of cells; Cytogeny = cytogenesis. Cytology, the study of cells and their formation. Cytoplasm, the substance forming the essential constituent of cells, protoplasm; spec. the protoplasm of a cell as distinguished from the nucleus; Cytoplasmic a., pertaining to or consisting of cytoplasm; Cytoplast, the body or unit of protoplasm contained in a cell (cf. BIOPLAST). Cytopyge [Gr. πῡγή rump], the excretory opening or anus of a unicellular animal. Cytostome [Gr. στόμα mouth], the absorbent opening or mouth of a unicellular animal; Cytostomous a., pertaining to the cytostome. Cytozoa sb. pl. (Zool.), [Gr. ζῷον animal], a synonym of the Sporozoa or Gregarinida.
1859. Todd, Cycl. Anat., V. 140/1. The blastodermic cells are produced by a process of cytogenesis.
1876. Wagner’s Gen. Pathol., 439. Cytogenic tissue consists of a vascular fibrous framework and of cells.
1874. Jones & Siev., Pathol. Anat., 153. Cytogenous connective-tissue is met with in other organs.
1889. Athenæum, 4 May, 571/2. The questions of variation, heredity, cytology, &c.
1874. Barker, trans. Frey’s Histol., 66. This primordial cell-substance is known at the present day by the name protoplasm. It has also received from Beale, Kölliker, and Dujardin respectively the names bioplasm, cytoplasm, and sarcode.
1889. Vines, in Nature, 24 Oct., 624. The embryo is developed from the whole of the nucleus and more or less of the cytoplasm of the ovum.
1891. M. Hartog, in Nature, XLIV. 484/1. The union of cells, cytoplast to cytoplast.
1888. Rolleston & Jackson, Anim. Life, 833. Infusoria … A mouth or cytostome with an oral tube, and an anal spot or cytopyge, are absent only in the endoparasitic Opalinidae.
1885. Ray Lankester, in Encycl. Brit., XIX. 852. The falciform young … penetrates a cell of some tissue of its host and there undergoes the first stages of its growth (hence called Cytozoa).
