triadism

triad

[trahy-ad, -uhd]
noun
1.
a group of three, especially 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, especially 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; < Latin triad- (stem of trias) < Greek triás See tri-, -ad1

triadic, adjective
triadism, noun
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World English Dictionary
triad (ˈtraɪæd)
 
n
1.  a group of three; trio
2.  chem an atom, element, group, or ion that has a valency of three
3.  music a three-note chord consisting of a note and the third and fifth above it
4.  an aphoristic literary form used in medieval Welsh and Irish literature
5.  the US strategic nuclear force, consisting of intercontinental ballistic missiles, submarine-launched ballistic missiles, and bombers
 
[C16: from Late Latin trias, from Greek; related to Greek treis three]
 
tri'adic
 
adj
 
'triadism
 
n

Triad (ˈtraɪæd)
 
n
any of several Chinese secret societies, esp one involved in criminal activities, such as drug trafficking

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
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, © 2010 Douglas Harper
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American Heritage
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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