Main definitions of -ad in US English:

: -ad1-ad2

-ad1

suffix

  • 1(forming nouns) in collective numerals.

    ‘triad’
    ‘pentad’
    1. 1.1 In groups, periods, or aggregates.
      ‘Olympiad’
  • 2(forming nouns) in names of females in classical mythology.

    ‘dryad’
    ‘naiad’
  • 3(forming nouns) in names of poems and similar compositions.

    ‘Iliad’
    ‘jeremiad’
  • 4(forming nouns) in names of members of some taxonomic groupings.

    ‘bromeliad’

Origin

From the Greek ending -as, -ad-.

Main definitions of -ad in US English:

: -ad1-ad2

-ad2

suffix

  • Forming nouns such as ballad, salad.

    Compare with -ade

Origin

From French -ade.