biol
51cell membrane — Biol. the semipermeable membrane enclosing the cytoplasm of a cell. [1865 70] * * * …
52cell wall — Biol. the definite boundary or wall that is part of the outer structure of certain cells, as a plant cell. See diag. under cell. [1840 50] * * * …
53colonial animal — Biol. 1. a collective life form comprising associations of individual organisms that are incompletely separated, as corals and moss animals. 2. any of the individual organisms in such a life form. [1880 85] * * * …
54columnar epithelium — Biol. epithelium consisting of one or more layers of elongated cells of cylindrical or prismatic shape. * * * …
55contact inhibition — Biol. the cessation of movement, growth, and division in cells that touch each other. [1960 65] * * * …
56cuboidal epithelium — Biol. epithelium consisting of one or more layers of cells of cuboid or polyhedral shape. * * * …
57fat cell — Biol. a cell in loose connective tissue that is specialized for the synthesis and storage of fat. Also called adipocyte. [1910 15] * * * …
58form genus — Biol. an artificial taxonomic category including species, esp. of fossil forms, grouped together on the basis of morphological resemblance. [1870 75] * * * …
59founder effect — Biol. the accumulation of random genetic changes in an isolated population as a result of its proliferation from only a few parent colonizers. * * * …
60freeze etching — Biol. the preparation of material for electron microscopic study by freeze fracturing and then subliming a layer of ice crystals from the fractured plane to expose the natural surfaces. Also, freezeetching. [1965 70] * * * …
