-id 1
a suffix of nouns that have the general sense "offspring of, descendant of," occurring originally 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; Attalid ), and in names of periodic meteor showers, with the base noun usually denoting the constellation or other celestial object in which the shower appears ( Perseid ).
[ -id-, s. of -is -ides ]
-id 2
a suffix occurring in English derivatives of modern Latin taxonomic names, esp. zoological families and classes; such derivatives are usually nouns denoting a single member of the taxon or adjectives with the sense "pertaining to" the taxon: arachnid; canid.
[ -ides -ID 1 , as sing. of NL -ida -IDA or -idae -IDAE ]
-id 3
var. of -ide: lipid.
-id 4
a suffix occurring in descriptive adjectives borrowed from Latin, often corresponding to nouns ending in -or 1 : fetid; humid; pallid.
[ -idus ]