[‹ NL Sialidae name of the family, equiv. to Sialid-, s. of Sialis a genus (Gk sialís a kind of bird) + -idae -id2]-id is a suffix occurring in English derivatives of modern Latin taxonomic names, esp.zoological families and classes; such derivatives are usually nouns denoting a singlemember of the taxon or adjectives with the sense “pertaining to” the taxon. Otherwords that use the affix -id include: arachnid, canid