Nod·dy n.; pl. Noddies
 1. A simpleton; a fool.
 Syn: -- tomnoddy.
 2. Zool. (a) Any tern of the genus Anous, as Anous stolidus. (b) The arctic fulmar (Fulmarus glacialis).  Sometimes also applied to other sea birds.
 3. An old game at cards.
 4. A small two-wheeled one-horse vehicle.
 5. An inverted pendulum consisting of a short vertical flat spring which supports a rod having a bob at the top; -- used for detecting and measuring slight horizontal vibrations of a body to which it is attached.
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