‖Pro‐tis″ta (?), n. pl. [NL., fr. Gr. πρώτιστοσ first.] (Zoöl.) A provisional group in which are placed a number of low microscopic organisms of doubtful nature. Some are probably plants, others animals.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.