‖Ar′chi‐an‐nel″i‐da (�), n. pl. [NL.; pref. archi- + annelida.] (Zoöl.) A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.