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/hep"tad/, n.1. the number seven.2. a group of seven.3. Chem. an element, atom, or group having a valence of seven.[1650-60; < Gk heptad- (s. of heptás). See HEPTA-, -AD1]
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Universalium. 2010.
heptad
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Heptad — Hep tad, n. [L. heptas the number seven. Gr. ?, ?, fr. epta seven.] (Chem.) An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad … The Collaborative International Dictionary of English
heptad — [hep′tad΄] n. [Gr heptas (gen. heptados) < hepta, SEVEN] a series or group of seven … English World dictionary
heptad — noun Etymology: Greek heptad , heptas, from hepta Date: 1660 a group of seven … New Collegiate Dictionary
heptad — [ hɛptad] noun technical a group or set of seven. Origin C17: from Gk heptas, heptad , from hepta seven … English new terms dictionary
heptad — hep•tad [[t]ˈhɛp tæd[/t]] n. 1) math. the number seven 2) math. a group of seven • Etymology: 1650–60; < Gk heptad , s. of heptás. See hepta , ad I … From formal English to slang
heptad — /ˈhɛptæd/ (say heptad) noun 1. the number seven. 2. a group of seven. 3. Chemistry an element, atom, or group having a valency of seven. {Late Latin heptas, from Greek: the number seven} …
Heptad repeat — The heptad repeat is an example of a structural motif which consists of a repeating pattern of amino acids: a b c d e f g H P P H P P Pwhere H represents hydrophobic residues and P represents polar residues. The positions of the heptad repeat are … Wikipedia
heptad — noun a group of seven things … Wiktionary
heptad — A septivalent chemical element or radical. * * * hep·tad (hepґtəd) any element having a valency of seven … Medical dictionary
HEPTAD — a term in chemistry to denote an atom that is the equivalent of seven atoms of hydrogen, from hepta, seven … The Nuttall Encyclopaedia
