Dyad Dy"ad, a. (Chem.) Having a valence or combining power of two; capable of being substituted for, combined with, or replaced by, two atoms of hydrogen; as, oxygen and calcium are dyad elements. See {Valence}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.


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  • Dyad — may refer to: Dyad (biology), a pair of sister chromatids occurring in prophase I of meiosis; may also be used to describe protein morphology Dyad (Greek philosophy), Greek philosophers principle of twoness or otherness Dyad (music), a set of two …   Wikipedia

  • Dyad — Dy ad, n. [L. dyas, dyadis, the number two. Gr. ?: cf. F. dyade. See two, and cf. {Duad}.] 1. Two units treated as one; a couple; a pair. [1913 Webster] 2. (Chem.) An element, atom, or radical having a valence or combining power of two. [1913… …   The Collaborative International Dictionary of English

  • dyad — dyad. См. диада. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • dyad — [dī′ad΄] n. [LL dyas (gen. dyadis) < Gr < dyo, TWO] 1. two units regarded as one; pair 2. Biol. a double chromosome resulting from the division of a tetrad in meiosis; half of a tetrad 3. Chem. an atom, element, or radical with a valence of …   English World dictionary

  • Dyad — The word dyad comes from the Greek dyas meaning the number two. In psychology, a dyad refers to a pair of persons in an interactional situation. For example, a patient and therapist, a woman and her husband, a girl and her stepfather, etc. In… …   Medical dictionary

  • dyad — /duy ad/, n. 1. a group of two; couple; pair. 2. Biol. a. a secondary morphological unit, consisting of two monads: a chromosome dyad. b. the double chromosomes resulting from the separation of the four chromatids of a tetrad. 3. Chem. an element …   Universalium

  • dyad — The dyad, a group of two members, is the smallest possible social group: if one person opts out the group ceases to exist. Two people can form an intimacy not found in larger groups, but the dyad also involves other basic elements of social… …   Dictionary of sociology

  • dyad — noun Etymology: Late Latin dyad , dyas, from Greek, from dyo Date: 1675 1. pair; specifically two individuals (as husband and wife) maintaining a sociologically significant relationship 2. a meiotic chromosome afte …   New Collegiate Dictionary

  • dyad — [ dʌɪad] noun technical something that consists of two elements or parts. ↘Mathematics an operator which is a combination of two vectors. Derivatives dyadic adjective Origin C17: from late L. dyas, dyad , from Gk duas, from duo two …   English new terms dictionary

  • dyad — dy•ad [[t]ˈdaɪ æd[/t]] n. 1) a group of two; couple; pair 2) biochem. cbl the double chromosomes resulting from the separation of the four chromatids of a tetrad 3) chem. an element, atom, or group having a valence of two 4) math. Math. two… …   From formal English to slang

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