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triadism

 - 4 dictionary results

tri⋅ad

  [trahy-ad, -uhd]
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–noun
1. a group of three, esp. of three closely related persons or things.
2. Chemistry.
a. an element, atom, or group having a valence of three. Compare 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. (initial capital letter) Military. the three categories of strategic-nuclear-weapons delivery systems: bombers, land-based missiles, and missile-firing submarines.
Origin:
1540–50; < L triad- (s. of trias) < Gk triás See tri-, -ad 1

Related forms:
tri⋅ad⋅ic, adjective
tri⋅ad⋅ism, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

triad 
1546, "group or set of three," from L.L. trias (gen. triadis), from Gk. trias (gen. triados), from treis "three" (see three). Musical sense of "chord of three notes" is from 1801.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: tri·ad
Pronunciation: 'trI-"ad also -&d
Function: noun
1 : a union or group of three triad of symptoms>
2 : a trivalent element, atom, or radical —tri·ad·ic /trI-'ad-ik/ adjective
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

triad tri·ad (trī'ād', -əd)
n.

  1. A collection of three things or symptoms having something in common.

  2. The transverse tubule, and the terminal cisternae on each side of it, in a skeletal muscle fiber.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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