Definition of thrush

• n. - Any one of numerous species of singing birds belonging to Turdus and allied genera. They are noted for the sweetness of their songs.
• n. - Any one of numerous species of singing birds more or less resembling the true thrushes in appearance or habits; as the thunderbird and the American brown thrush (or thrasher). See Brown thrush.
• n. - An affection of the mouth, fauces, etc., common in newly born children, characterized by minute ulcers called aphthae. See Aphthae.
• n. - An inflammatory and suppurative affection of the feet in certain animals. In the horse it is in the frog.