hexad noun.
['hɛksad] M17.[Greek hexad-, hexas a group of six, from hex six: see -AD1.]1. The number six in the Pythagorean system; a series of six numbers.
M17.b. A group of six.
L19.2. Chemistry. A hexavalent element or group.
M-L19. ■ he'xadic adjective.
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