octad
Americannoun
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a group or series of eight.
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Chemistry. an element, atom, or group having a valence of eight.
noun
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a group or series of eight
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chem an element or group with a valency of eight
Other Word Forms
Etymology
Origin of octad
1835–45; < Greek oktad- (stem of oktás ) group of eight, equivalent to okt- oct- + -ad -ad 1
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The number Eight, or the octad, is the first cube, that is to say, squared in all senses, as a die, proceeding from its base two, an even number; so is man four-square, or perfect.
From Curious Myths of the Middle Ages by Baring-Gould, S. (Sabine)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
