noddy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A dunce or fool; a simpleton.
• noun Any of several terns of the genera Anous and Procelsterna, found in tropical waters and usually having dark brown or black plumage with a white or gray head.

from The Century Dictionary.

• To make a fool of.
• noun A device designed to show the oscillation of the support of a pendulum.
• noun A simpleton; a fool.
• noun A large dark-colored tern or sea-swallow of the subfamily Sterninæ and the group Anoëæ or genus Anoüs, found on most tropical and warm-temperate sea-coasts: so called from their apparent stupidity.
• noun The murre, Lomvia troile.
• noun The ruddy duck, Erismatura rubida.
• noun An old game of cards, supposed to have been played like cribbage.
• noun The knave in this game.
• noun A kind of four-wheeled cab with the door at the back, formerly in use.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A stupid or silly person.
• noun television A cutaway scene of a television interviewer nodding, used to cover an editing gap in an interview.
• noun Any of several stout-bodied, gregarious terns of the genera Anous and Procelsterna, found in tropical seas.
• noun dated A small two-wheeled vehicle drawn by a single horse.
• noun 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.
• noun obsolete, uncountable An old card game.