triad

[trahy-ad, -uhd]

noun

1. a group of three, especially of three closely related persons or things.

2. Chemistry.

   1. an element, atom, or group having a valence of three.

   2. 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. Military.,  Triad, the three categories of delivery systems for strategic nuclear weapons, namely bombers, land-based missiles, and missile-firing submarines.

   The report says this missile is required in order to sustain an effective air leg of the Triad.

triad

¹

/ ˈtraɪæd /

noun

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

Triad

²

/ ˈtraɪæd /

noun

1. any of several Chinese secret societies, esp one involved in criminal activities, such as drug trafficking

Other Word Forms

• triadic adjective
• triadism noun

Word History and Origins

Origin of triad¹

First recorded in 1540–50; from Latin triad- (stem of trias ), from Greek triás; tri-, -ad ¹

Word History and Origins

Origin of triad¹

C16: from Late Latin trias , from Greek; related to Greek treis three

Example Sentences

I bump into a triad of girls talking in the doorway.

Read more on Literature

Chinese leader Xi Jinping for the first time showcased China’s nuclear triad—its land, sea and air-launched ballistic nuclear missiles—at a Beijing parade honoring the 80th anniversary of victory over Japan in September.

Read more on The Wall Street Journal

That “Die My Love” is among a triad of this fall’s “mother on the verge” resurgence — squeezed between last month’s “If I Had Legs I’d Kick You” and Thanksgiving’s “Hamnet” — doesn’t exactly help its case.

Read more on Salon

In a primary debate, he was asked about the nuclear triad and clearly had no idea what they were talking about, which suggested that he never did get around to studying up on the subject.

Read more on Salon

These matching maps round out a triad of evidence that suggests excess gamma rays in the center of the Milky Way could originate with dark matter.

Read more on Science Daily

Related Words

• triumvirate