Ar′chæ‐o‐zo″ic (�), a. [Gr. αρχαἰ̑οσ ancient + ζῳ̑ον animal.] (Zoöl.) Like or belonging to the earliest forms of animal life.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.