‖O′to‐zo″um (?), n. [NL., fr. Gr. �, a fabled giant + ζο̑ͅον an animal.] (Paleon.) An extinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.