octad

[ ok-tad ]

noun

1. a group or series of eight.
2. Chemistry. an element, atom, or group having a valence of eight.

octad

/ ˈɒktæd /

noun

1. a group or series of eight
2. chem an element or group with a valency of eight

Derived Forms

• ocˈtadic, adjective

Other Words From

• oc·tadic adjective

Word History and Origins

Origin of octad¹

1835–45; < Greek oktad- (stem of oktás ) group of eight, equivalent to okt- oct- + -ad -ad ¹

Word History and Origins

Origin of octad¹

C19: from Greek oktās, from oktō eight

Example Sentences

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 Project Gutenberg