Definition of noddy

• n. - A simpleton; a fool.
• n. - Any tern of the genus Anous, as A. stolidus.
• n. - The arctic fulmar (Fulmarus glacialis). Sometimes also applied to other sea birds.
• n. - An old game at cards.
• n. - A small two-wheeled one-horse vehicle.
• n. - 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.