Standard Lemma guide

tetrad

noun · 8 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Canada, General-American, Received-Pronunciation: /ˈtɛtɹæd/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • Australian: /ˈtetɹæd/
  • New-Zealand: /ˈtetɹɛd/

1

noun

Meaning 1

A group of four things.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: foursome, quartet, quadruplet, quadruplicity, quadrad, quaternion, quaternity, tetrad, tetraplet

Antonyms: none provided

2

noun

Meaning 2

Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.

Definition source: English Wiktionary via Wiktextract

Topics: biology, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.

Definition source: English Wiktionary via Wiktextract

Topics: biology, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A unit of land area of two by two (that is, four) square kilometres.

Definition source: English Wiktionary via Wiktextract

Topics: cartography, geography, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

A tetravalent atom or radical.

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

A group of four basis vectors for a four-dimensional manifold in differential geometry.

Definition source: English Wiktionary via Wiktextract

Topics: mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

A chord comprised of four notes; a tetrachord.

Definition source: English Wiktionary via Wiktextract

Topics: entertainment, lifestyle, music

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

the cardinal number that is the sum of three and one

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: four, 4, IV, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe

Antonyms: none provided

Broader terms: digit, figure

History

Etymology

From Ancient Greek τετράς (tetrás), analysable as tetra- + -ad.

Across languages

Translations

10 source translations are retained for this English entry.

  • Bulgarian: четворка (četvorka) — Translations
  • Finnish: tetradi — Translations
  • Finnish: bivalentti — Translations
  • French: tétrade — Translations
  • German: Tetrade — Translations
  • Greek: τετράδα (tetráda) — Translations
  • Ido: tetrado — Translations
  • Italian: tetrade — Translations
  • Russian: тетрада (tetrada) — Translations
  • Spanish: tétrada — Translations