| 单词 | triad |
| 释义 | triad —triadic, adj. —triadism, n. /truy"ad, -euhd/, n. 1. a group of three, esp. of three closely related persons or things. 2. Chem. a. an element, atom, or group having a valence of three. Cf. monad (def. 2), dyad (def. 3). b. a group of three closely related compounds or elements, as isomers or halides. 3. Music. a chord of three tones, esp. one consisting of a given tone with its major or minor third and its perfect, augmented, or diminished fifth. 4. (cap.) Mil. the three categories of strategic-nuclear-weapons delivery systems: bombers, land-based missiles, and missile-firing submarines. [1540-50; < L triad- (s. of trias) < Gk triás See TRI-, -AD1] |
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