dy·ad /ˈdaɪˌæd, əd/
二數,一對,二元一位
dy·ad /ˈdaɪˌæd, əd/ 名詞
二聯體,二分體
dyad
二價元素
Dy·ad n.
1. Two units treated as one; a couple; a pair.
2. Chem. An element, atom, or radical having a valence or combining power of two.
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.
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dyad
n : two items of the same kind [syn: couple, pair, twosome,
twain, brace, span, yoke, couplet, distich,
duo, duet, duad]