1. -id
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).
2. -id
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.; lipid.
3. -id
a suffix occurring in descriptive adjectives borrowed from Latin, often corresponding to nouns ending in -or1:
humid; pallid.
Etymology: (< L -idus)
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Definitions of -id 
