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From The Collaborative International Dictionary of English v.0.48:
Noddy \Nod"dy\, n.; pl. Noddies. [Prob. fr. nod to incline the head, either as in assent, or from drowsiness.] 1. A simpleton; a fool. --L'Estrange. Syn: tomnoddy. [1913 Webster] 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. [1913 Webster] 3. An old game at cards. --Halliwell. [1913 Webster] 4. A small two-wheeled one-horse vehicle. [1913 Webster] 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. [1913 Webster]