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From The Collaborative International Dictionary of English v.0.48:
Vertigo \Ver"ti*go\ (?; 277), n.; pl. E. Vertigoes, L. Vertigines. [L., fr. vertere to turn. See Verse.] 1. (Med.) Dizziness or swimming of the head; an affection of the head in which objects, though stationary, appear to move in various directions, and the person affected finds it difficult to maintain an erect posture; giddiness. --Quain. [1913 Webster] 2. (Zool.) Any one of numerous species of small land snails belonging to the genus Vertigo, having an elongated or conical spiral shell and usually teeth in the aperture. [1913 Webster]