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n. pl. e·pis·ta·ses (-sēz′)
1. An interaction between nonallelic genes in which the genotype at one locus affects the expression of alleles at another locus.
2. A film that forms over the surface of a urine specimen.
3. The suppression of a bodily discharge or secretion.
[Greek, stoppage, from epistanai, to stop, check : ep-, epi-, epi- + histanai, to place; see stā- in Indo-European roots.]
ep′i·stat′ic (ĕp′ĭ-stăt′ĭk) adj.
1. (Medicine) obsolete scum on the surface of a liquid, esp on an old specimen of urine
2. (Medicine) med the arrest or checking of a bodily discharge, esp bleeding
3. (Genetics) 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]
e•pis•ta•sis(ɪˈpɪs tə sɪs)
n., pl. -ses (-ˌsiz)
a form of interaction between nonallelic genes in which one combination of such genes has a dominant effect over other combinations.
[1915–20; probably after epistatic (1907) (probably epi- + static, taken as meaning “standing above”)]
ep•i•stat•ic (ˌɛp əˈstæt ɪk) adj.