from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The back ectodermal part of an alimentary canal.
from The Century Dictionary and Cyclopedia
- n. See proctodæum.
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)
From Ancient Greek πρωκτός with ὁδαῖος, of ὁδός. (Wiktionary)
This invagination is termed the proctodeum, and it meets with the entoderm of the hind-gut and forms with it the anal membrane.