There are 2 definitions of -ad in English:

-ad1

Syllabification: -ad

suffix

Forming nouns:
1In collective numerals: pentad triad
1.1In groups, periods, or aggregates: Olympiad
2In names of females in classical mythology, such as Dryad and Naiad.
2.1In names of districts such as Troad.
3In names of poems and similar compositions: Iliad jeremiad
4Forming names of members of some taxonomic groupings: bromeliad

Origin

from Greek -ad- (from nouns ending in -as).

Definition of -ad in:

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Word of the day inamorata
Pronunciation: inˌaməˈrätə
noun
a person's female lover

There are 2 definitions of -ad in English:

-ad2

Syllabification: -ad

suffix

Forming nouns such as ballad, salad. Compare with -ade1.

Origin

representing the French noun ending -ade.

Definition of -ad in: