Vertigo
Vertigo (?; 277) , noun
[Latin, from vertere to turn. See Verse.]
1.
(Medicine) 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
2.
(Zoology) 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.