Entry 2 senses · 2 variants Webster, 1913 Birk /bẽrk/ · IPA /bɝk/ n. n. 01 n. A birch tree. 1. A birch tree.[Prov. Eng.] 02 n. A small European minnow (Leuciscus phoxinus). 1. A small European minnow (Leuciscus phoxinus).(Zool.)