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1. a suffix occurring in loanwords from Greek denoting a group or unit comprising a certain number, sometimes of years: dyad; triad.
2. a suffix meaning "derived from," "related to," "concerned with," "associated with" (oread), introduced in loanwords from Greek (Olympiad; oread), used sporadically in imitation of Greek models, as Dunciad, after Iliad.
[Gk -ad- (s. of -as), specialization of fem. adjective-forming suffix, often used substantively]
-ad2
var. of -ade1: ballad.
-ad3
Anat., Zool. a suffix forming adverbs from nouns signifying parts of the body, denoting a direction toward that part: dextrad; dorsad; mediad.
[ < L ad toward, anomalously suffixed to the noun; introduced as a suffix by Scottish anatomist John Barclay (1758-1826) in 1803]

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Universalium. 2010.

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