The Collaborative International Dictionary of English v.0.48:
yoghurt \yo"ghurt\, yoghourt \yo"ghourt\, yoghourt \yo"ghourt\ n. custardlike food made from curdled milk. [WordNet 1.5]WordNet (r) 3.0 (2006):
yoghurt n 1: a custard-like food made from curdled milk [syn: yogurt, yoghurt, yoghourt]