EPHEMERA

ephemera. Ephemera, n. an insect whose life is one day only, or very short

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‖E‐phem″e‐ra (?), n. [] 1. 1. (Med.) A fever of one day's continuance only.
2. 2. (Zoöl.) A genus of insects including the day flies, or ephemeral flies. See Ephemeral fly, under Ephemeral.