The Collaborative International Dictionary of English v.0.48:
amygdalin \a*myg"da*lin\ ([.a]*m[i^]g"d[.a]*l[i^]n), n. (Chem.) A glucoside extracted from bitter almonds as a white, crystalline substance. [1913 Webster]WordNet (r) 3.0 (2006):
amygdalin n 1: a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds