1
a
: an extinct heavy flightless bird (Raphus cucullatus synonym Didus ineptus of the family Columbidae) of the island of Mauritius that was larger than a turkey and was related to the pigeon
b
: an extinct flightless bird (Raphus solitarius) of the island of Réunion similar to and closely related to the dodo
2
a
: one hopelessly behind the times
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Merriam-Webster unabridged
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