a combining form meaning “nucleus of a cell,” used in the formation of compound words:
combining form
indicating the nucleus of a cell: karyogamy

before vowels kary-, word-forming element used since c.1874 in biological terms referring to cell nuclei, from Greek karyon “nut, kernel,” possibly from PIE root *kar- “hard” (see hard (adj.)).

karyo- or caryo-
Cell nucleus: karyogamy.


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  • Karyocyte

    karyocyte kar·y·o·cyte (kār’ē-ə-sīt’) n. An immature normoblast.

  • Karyogamy

    [kar-ee-og-uh-mee] /ˌkær iˈɒg ə mi/ noun, Cell Biology. 1. the fusion of the nuclei of cells, as in fertilization. /ˌkærɪˈɒɡəmɪ/ noun 1. (biology) the fusion of two gametic nuclei during fertilization karyogamy kar·y·og·a·my (kār’ē-ŏg’ə-mē) n. The coming together and fusing of cell nuclei, as in fertilization. kar’y·o·gam’ic (-ə-gām’ĭk) adj.

  • Karyogenesis

    karyogenesis kar·y·o·gen·e·sis (kār’ē-ə-jěn’ĭ-sĭs) n. Formation of the nucleus of a cell. kar’y·o·gen’ic (-jěn’ĭk) adj.

  • Karyogram

    /ˈkærɪəʊˌɡræm/ noun 1. a diagram or photograph of the chromosomes of a cell, arranged in homologous pairs and in a numbered sequence Also called idiogram

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