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BNC: 46050 COCA: 18814

dyad

noun
/ˈdaɪæd/
/ˈdaɪæd/
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  1. (specialist) something that consists of two parts二分体；二联体
    • the mother-child dyad母子二分体
  2. (mathematics数学) an operator that is the combination of two vectors并矢
    3. Word Originlate 17th cent. (originally denoting the number two or a pair): from late Latin dyas, dyad-, from Greek duas, from duo ‘two’. Current senses date from the late 19th cent.

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