One of the mysteries of the English language finally explained.
In certain invertebrates with an eversible proboscis (as nemerteans, whelks, etc.): the cavity or chamber lying between the retracted proboscis and the exterior, through which the proboscis may be everted.
Late 19th century; earliest use found in Annals and Magazine of Natural History. From German Rhynchodaeum from rhyncho- + ancient Greek ὁδαῖος that is on or by the road, after English proctodeum, stomodaeum.
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