One of the mysteries of the English language finally explained.
The earliest parasitic form of the larval stage of certain tapeworms, in which the body is solid and has begun to develop a scolex but retains the posterior hooks found in the preceding embryonic stage.
Early 20th century; earliest use found in Journal of the American Veterinary Medical Association. From pro- + ancient Greek κέρκος tail + -oid, after French procercoïde.
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