noun, plural epistases [ih-pis-tuh-seez] .
Genetics. a form of interaction between nonallelic genes in which one combination of such genes has a dominant effect over other combinations.
the stoppage of a secretion or discharge.
a scum that forms on a urine specimen upon standing.

1915–20; < Greek epístasis stopping, stoppage. See epi-, stasis

epistatic [ep-uh-stat-ik] , adjective
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World English Dictionary
epistasis (ɪˈpɪstəsɪs)
1.  obsolete scum on the surface of a liquid, esp on an old specimen of urine
2.  med the arrest or checking of a bodily discharge, esp bleeding
3.  genetics Also called: hypostasis the suppression by a gene of the effect of another gene that is not its allele
[C19: from Greek: a stopping, from ephistanai to stop, from epi- + histanai to put]

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Word Origin & History

from Gk. epistasis a stopping, stoppage, from epi upon + stasis a stopping or standing (see stasis).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

epistasis e·pis·ta·sis (ĭ-pĭs'tə-sĭs)
n. pl. e·pis·ta·ses (-sēz')

  1. A film that forms over the surface of a urine specimen.

  2. An interaction between nonallelic genes, especially an interaction in which one gene suppresses the expression of another.

  3. The suppression of a bodily discharge or secretion.

ep'i·stat'ic (ěp'ĭ-stāt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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