aff. a suffix of nouns that have the general sense “offspring of, descendant of,” occurring orig. in loanwords from Greek (Atreid; Nereid), and productive in English on the Greek model, esp. in names of dynasties, with the dynasty's founder as the base noun (Abbasid; Fatimid), and in names of periodic meteor showers, with the base noun usu. denoting the constellation or other celestial object in which the shower appears (Perseid)•Etymology: < L -id-, s. of -is < Gk II-idaff. a suffix occurring in English derivatives of modern Latin taxonomic names, esp. zoological families and classes; such derivatives are usu. nouns denoting a single member of the taxon or adjectives with the sense “pertaining to” the taxon:arachnid; canid[/ex]•Etymology: < Gk -idēs III-idaff.var. of -ide:lipid[/ex]IV-idaff. a suffix occurring in descriptive adjectives borrowed from Latin, often corresponding to nouns ending in -or:humid; pallid[/ex]•Etymology: < L -idus
From formal English to slang. 2014.