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The Collaborative International Dictionary of English v.0.48:

Boa \Bo"a\ (b[=o]"[.a]), n.; pl. Boas. [L. boa a kind of water serpent. Perh. fr. bos an ox.] 1. (Zool.) A genus of large American serpents, including the boa constrictor, the emperor boa of Mexico (Boa imperator), and the chevalier boa of Peru (Boa eques). [1913 Webster] Note: The name is also applied to related genera; as, the dog-headed boa (Xiphosoma caninum). [1913 Webster] 2. A long, round fur tippet; -- so called from its resemblance in shape to the boa constrictor. [1913 Webster]