a suffix occurring in loanwords from greek denoting a group or unit comprising a certain number, sometimes of years: dyad; triad .
a suffix meaning “derived from,” “related to,” “concerned with,” “-ssociated with” (oread), introduced in loanwords from greek (olympiad; oread), used sporadically in imitation of greek models, as dunciad , after iliad .
variant of -ade1 : ballad .
anatomy, zoology. a suffix forming adverbs from nouns signifying parts of the body, denoting a direction toward that part: dextrad; dorsad; mediad .
a group or unit (having so many parts or members) triad
an epic poem concerning (the subject indicated by the stem) dunciad
word origin
via latin from greek -ad- (plural -ades), originally forming adjectives; names of epic poems are all formed on the model of the iliad
denoting direction towards a specified part in anatomical descriptions cephalad
word origin
from latin ad to, towards
suffix denoting collective numerals (cf. olympiad), from gk. -as (gen. -ados), a suffix forming fem. nouns; also used in fem. patronymics (dryad, naiad, also, in plural, pleiades, hyades).

-ad suff.
in the direction of; toward: cephalad.

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    a suffix occurring in loanwords from greek, the plural of -ad1 : hyades; pleiades.

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    -ae occasional plural suffix of words ending in -a, most of which, in eng., are from l. nom. fem. sing. nouns, which in l. form their plurals in -ae. but plurals in -s were established early in eng. for many of them (e.g. idea, arena) and many have crossed over since. it is now impossible […]

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    variant of -ea: athenaea.

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