dodo

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

• noun A large flightless bird (Raphus cucullatus) with a hooked beak that inhabited the island of Mauritius in the Indian Ocean until it became extinct in the late 1600s.
• noun Informal One who is out-of-date, as in dress or ideas.
• noun Informal A stupid person; an idiot.

from The Century Dictionary.

• noun A recently extinct bird of Mauritius, Didus ineptus, the type of the family Dididæ and suborder Didi, now usually assigned to the order Columbæ.
• noun [This is the earliest known English mention of the bird.]

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

• noun (Zoöl.) A large, extinct bird (Didus ineptus), formerly inhabiting the Island of Mauritius. It had short, half-fledged wings, like those of the ostrich, and a short neck and legs; -- called also dronte. It was related to the pigeons.

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

• noun A large, flightless bird, Raphus cucullatus, related to the pigeon, that is now extinct (since the 1600s) and was native to Mauritius.
• noun figuratively A person or organisation which is very old or has very old-fashioned views or is not willing to change and adapt.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone whose style is out of fashion
• noun extinct heavy flightless bird of Mauritius related to pigeons