PENTAD

five, cinque, quint, quintet, fivesome, quintuplet, pentad, fin, Phoebe, Little Phoebe

(noun) the cardinal number that is the sum of four and one

Source: WordNet® 3.1

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Etymology

Noun

pentad (plural pentads)

A group or series of five things.

A mean average value of temperature, etc, taken every five days.

(chemistry) Any element, atom, or radical having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad.

Synonyms

• (group of five): fivesome; see also quintet

Coordinate terms

• monad · duad, dyad · triad · tetrad · pentad · hexad · heptad · octad · ennead, nonad · decad, decade · hendecad · dodecad, duodecade

Anagrams

• panted, pedant

Source: Wiktionary

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Pen"tad, n. Etym: [Gr. (Chem.)

Definition: Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.

Pen"tad, a. (Chem.)

Definition: Having the valence of a pentad.

Source: Webster’s Unabridged Dictionary 1913 Edition

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