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Webster 1913 Edition

Adj.

[Gr. [GREEK] odd, from [GREEK] over.]

(Chem.)

Odd; not even; – said of elementary substances and of radicals whose valence is not divisible by two without a remainder. Contrasted with

artiad

[Archaic]

perissad ‎(not comparable)

(chemistry) odd; not even; said of elementary substances and of radicals whose valence is not divisible by two without a remainder.