a small european singing bird (erythacus rubecula), having a reddish breast; -- called also robin redbreast, robinet, and ruddock.-an american singing bird (merula migratoria), having the breast chestnut, or dull red. the upper parts are olive-gray, the head and tail blackish. called also robin redbreast, and migratory thrush.-any one of several species of australian warblers of the genera petroica, melanadrays, and allied genera; as, the scarlet-breasted robin (petroica mullticolor).-any one of several asiatic birds; as, the indian robins. see indian robin, below.