The Collaborative International Dictionary of English v.0.48:

Dodo \Do"do\, n.; pl. Dodoes. [Said to be fr. Pg. doudo silly,
   foolish (cf. Booby); this is fr. Prov. E. dold, the same
   word as E. dolt.] (Zool.)
   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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dodo
    n 1: someone whose style is out of fashion [syn: dodo, fogy,
         fogey, fossil]
    2: extinct heavy flightless bird of Mauritius related to pigeons
       [syn: dodo, Raphus cucullatus]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "dodo":
   Methuselah, antediluvian, antique, back number, boob, conservative,
   dad, dimwit, dolt, dummy, elder, fogy, fossil, fud, fuddy-duddy,
   granny, has-been, idiot, longhair, matriarch, mid-Victorian, moron,
   mossback, nitwit, numskull, old believer, old crock, old dodo,
   old fogy, old liner, old man, old poop, old woman, old-timer,
   patriarch, pop, pops, reactionary, regular old fogy, relic,
   simpleton, square, starets, traditionalist



Easton's 1897 Bible Dictionary:

Dodo
   amatory; loving. (1.) A descendant of Issachar (Judg. 10:1).

     (2.) An Ahohite, father of Eleazar, who was one of David's
   three heroes (2 Sam. 23:9; 1 Chr. 11:12). He was the same with
   Dodai mentioned in 1 Chr. 27:4.

     (3.) A Bethlehemite, and father of Elhanan, who was one of
   David's thirty heroes (2 Sam. 23:24).


Hitchcock's Bible Names Dictionary (late 1800's):

Dodo, his uncle