‖Gyr″o‐dus (jĭr″ō̍‐dŭs), n. [NL., fr. Gr. γυρόσ round + οδοὔσ tooth.] (Paleon.) A genus of extinct oölitic fishes, having rounded teeth in several rows adapted for crushing.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.