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单词 pentad
释义

WordReference Random House Unabridged Dictionary of American English © 2024
pen•tad  (pen′tad),USA pronunciation n. 
  1. a period of five years.
  2. Mathematicsa group of five.
  3. the number five.
  4. Chemistrya pentavalent element or group.
  5. Meteorology[Climatol.]a period of five consecutive days.
  • Greek pentad- (stem of pentás) group of five. See pent-, -ad1
  • 1645–55

Collins Concise English Dictionary © HarperCollins Publishers::
pentad /ˈpɛntæd/ n
  1. a group or series of five
  2. the number or sum of five
  3. a period of five years
  4. a pentavalent element, atom, or radical
  5. a period of five days
Etymology: 17th Century: from Greek pentas group of five
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更新时间：2025/2/22 21:15:22