thrush (n.2) Look up thrush at Dictionary.com
throat disease, 1660s, probably from a Scandinavian source (such as Norwegian, Danish trøske, Swedish torsk), but its roots and original meaning are unclear.
thrush (n.1) Look up thrush at Dictionary.com
type of songbird, Old English þræsce, variant of þrysce, from Proto-Germanic *thruskjon (source also of Old Norse þröstr, Norwegian trost, Old High German drosca), from PIE *trozdo- (source also of Latin turdus, Lithuainian strazdas "thrush," Middle Irish truid, Welsh drudwy "starling," Old Church Slavonic drozgu, Russian drozdu).