junco UK /ˈd͡ʒʌŋkəʊ/US /ˈd͡ʒʌŋkoʊ/ noun2 •Any bird of the genus Junco, which includes several species of North American sparrow. •(no longer used) The common reed bunting (Emberiza schoeniclus), a bird found in Europe and much of the Palearctic.Junco, the Reed-Sparrow; a Bird. — 1658 formsjuncoes · juncos