American Heritage® Dictionary of the English Language, Fourth Edition
- n. An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage.
Century Dictionary and Cyclopedia
- n. See proctodæum.
- n. The back ectodermal part of an alimentary canal.
- From Ancient Greek πρωκτός with ὁδαῖος, of ὁδός. (Wiktionary)
- New Latin prōctodeum : Greek prōktos, anus + New Latin -odeum (probably from Greek hodaion, neuter of hodaios, on the way, from hodos, way). (American Heritage® Dictionary of the English Language, Fourth Edition)
“This invagination is termed the proctodeum, and it meets with the entoderm of the hind-gut and forms with it the anal membrane.”
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