‖Chæ‐top″o‐da (?), n. pl. [NL., from Gr. � hair + -poda.] (Zoöl.) A very extensive order of Annelida, characterized by the presence of lateral setæ, or spines, on most or all of the segments. They are divided into two principal groups: Oligochæta, including the earthworms and allied forms, and Polychæta, including most of the marine species.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.