a prefix occurring in loanwords from Latin, where it meant “toward” and indicated direction, tendency, or addition:Usually assimilated to the following consonant; see adjoin.
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,” “associated with” (), introduced in loanwords from Greek (), used sporadically in imitation of Greek models, asafter oread