From The Collaborative International Dictionary of English v.0.48 :
moccasin \moc"ca*sin\, n. [An Indian word. Algonquin makisin.]
[Sometimes written moccason.]
1. A shoe made of deerskin, or other soft leather, the sole
and upper part being one piece. It is the customary shoe
worn by the American Indians.
[1913 Webster]
2. (Zool.) A poisonous snake of the Southern United States.
The water moccasin ({Ancistrodon piscivorus syn.
Agkistrodon piscivorus, also called cottonmouth and
cottonmouth water moccasin) is usually found in or near
water. Above, it is olive brown, barred with black;
beneath, it is brownish yellow, mottled with darker. The
upland moccasin is Ancistrodon atrofuscus. They resemble
rattlesnakes, but are without rattles.
[1913 Webster]
Moccasin flower (Bot.), a species of lady's slipper
({Cypripedium acaule) found in North America. The lower
petal is two inches long, and forms a rose-colored
moccasin-shaped pouch. It grows in rich woods under
coniferous trees.
[1913 Webster]