-ad

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-ad suffix (= F. -ade) repr. L. — Gr. -ad- (nom. -as, pl. -ades) in (i) coll. numerals, as TRIAD, MYRIAD, and similarly OLYMPIAD; (ii) fem. patronymics, as DRYAD, NAIAD; (iii) the name of Homer's Iliad, imitated in Dunciad, etc. (In decade the F. form is retained.)