"thrush," Old English þrostle "thrush," from Proto-Germanic *thrust- (source also of Old Saxon throsla, Old High German droscala, German Drossel "thrush"), altered from (perhaps a diminutive of) *thurstaz (see thrush (n.1)).
thrombophlebitis
thrombosis
thrombus
throne
throng
throstle
throttle
through
throughly
throughout
throughput