Entry 2 senses · 2 variants Webster, 1913 Passerine · Pas·ser·ine · IPA /ˈpæsəˌɹaɪn/ a. n. 01 a. Of or pertaining to the Passeres. 1. Of or pertaining to the Passeres.(Zool.) “The columbine, gallinaceous, and passerine tribes people the fruit trees.” — Sydney Smith. 02 n. One of the Passeres. 1. One of the Passeres.(Zool.)