One of the mysteries of the English language finally explained.
In an arthropod: the unsegmented region at the anterior end of the body; specifically the prostomial region of an arthropod embryo.
Early 20th century; earliest use found in Journal of the Royal Microscopical Society. From French acron from ancient Greek ἄκρον extremity, use as noun of neuter of ἄκρος highest, topmost.
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