1. -ad
a suffix occurring in loanwords from Greek denoting a group or unit comprising a certain number, sometimes of years:
myriad; Olympiad; triad.
2. -ad
a suffix meaning “derived from,”“related to,”“associated with,” occurring in loanwords from Greek (dryad; oread) and in New Latin coinages on a Greek model (bromeliad; cycad).
3. -ad
a suffix used, on the model of Iliad, in the names of epics, speeches, etc., derived from proper names:
Dunciad; jeremiad.
4. -ad
var. of -ade1:
ballad; salad.
5. -ad
a suffix used in anatomy to form adverbs from nouns signifying parts of the body, denoting a direction toward that part:
ectad.
Etymology: (< L ad toward, anomalously suffixed to the noun)
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Definitions of -ad 
