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单词 heptad
释义

WordReference Random House Unabridged Dictionary of American English © 2024
hep•tad  (hep′tad),USA pronunciation n. 
  1. Mathematicsthe number seven.
  2. Mathematicsa group of seven.
  3. Chemistryan element, atom, or group having a valence of seven.
  • Greek heptad- (stem of heptás). See hepta-, -ad1
  • 1650–60

Collins Concise English Dictionary © HarperCollins Publishers::
heptad /ˈhɛptæd/ n
  1. a group or series of seven
  2. the number or sum of seven
  3. an atom or element with a valency of seven
Etymology: 17th Century: from Greek heptas seven
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更新时间：2025/7/31 2:28:05