[ 'ə:gɒt ]
■ noun
1》 a fungal disease of rye and other cereals, forming black elongated fruiting bodies which are a source of various medicinal alkaloids.
2》 a small horny protuberance on the back of a horse's fetlock.
Origin
C17: from Fr., from OFr. argot 'cock's spur' (because of the appearance produced by the disease).