Pro′to‐zo″ic (?), a. 1. (Zoöl.) Of or pertaining to the Protozoa.
2. (Geol.) Containing remains of the earliest discovered life of the globe, which included mollusks, radiates and protozoans.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.