American Heritage® Dictionary of the English Language, Fourth Edition
- n. Direct cell division by simple cleavage of the nucleus, without spindle formation or the appearance of chromosomes.
Century Dictionary and Cyclopedia
- n. In cytology, direct celldivision, akinesis or karyostenosis, as opposed to the indirect form of division (mitosis, karyokinesis, which see): so called from the absence of thread-like figures in the nucleus.
- n. biology Direct division of a cell by cleavage of the nucleus without the formation of chromosomes
GNU Webster's 1913
- n. (Biol.) Cell division in which there is first a simple cleavage of the nucleus without change in its structure (such as the formation of chromosomes), followed by the division of the cytoplasm; direct cell division; -- opposed to
mitosis. It is not the usual mode of division, and is believed by many to occur chiefly in highly specialized cells which are incapable of long-continued multiplication, in transitory structures, and in those in early stages of degeneration.
- n. the direct method of cell division characterized by simple division of the nucleus without formation of chromosomes
- a- + mitosis (Wiktionary)
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