noun, plural proc·to·de·a [prok-tuh-dee-uh] /ˌprɒk təˈdi ə/, proc·to·de·ums. Embryology.
a depression in the ectoderm of the anal region of a young embryo, which develops into part of the anal canal.
Origin of proctodeum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
n. pl. proc•to•de•ums
An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage.anal pit
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.