‖E‐phem″e‐ra (?), n. 1. (Med.) A fever of one day's continuance only.
2. (Zoöl.) A genus of insects including the day flies, or ephemeral flies. See Ephemeral fly, under Ephemeral.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.