[ ih-pis-tuh-sis ]

noun,plural e·pis·ta·ses [ih-pis-tuh-seez]. /ɪˈpɪs təˌsiz/.
  1. Genetics. a form of interaction between nonallelic genes in which one combination of such genes has a dominant effect over other combinations.

  2. Medicine/Medical.

    • the stoppage of a secretion or discharge.

    • a scum that forms on a urine specimen upon standing.

Origin of epistasis

First recorded in 1915–20, epistasis is from the Greek word epístasis stopping, stoppage. See epi-, stasis

Other words from epistasis

  • ep·i·stat·ic [ep-uh-stat-ik], /ˌɛp əˈstæt ɪk/, adjective

Words Nearby epistasis

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

British Dictionary definitions for 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

  1. Also called: hypostasis genetics the suppression by a gene of the effect of another gene that is not its allele

Origin of epistasis

C19: from Greek: a stopping, from ephistanai to stop, from epi- + histanai to put

Derived forms of epistasis

  • epistatic (ˌɛpɪˈstætɪk), adjective

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