Noddy

Part of speech: noun (n.)

1. A simpleton; a fool. L'Estrange.

2. Any tern of the genus Anous, as A. stolidus.

3. The arctic fulmar (Fulmarus glacialis). Sometimes also applied to other sea birds.

4. An old game at cards. Halliwell.

5. A small two-wheeled one-horse vehicle.

6. 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.