noun, plural proctodea [prok-tuh-dee-uh] , proctodeums. Embryology.
a depression in the ectoderm of the anal region of a young embryo, which develops into part of the anal canal.

1875–80; < Neo-Latin < Greek prōkt- proct- + Neo-Latin -odeum < Greek hodaîon, neuter of hodaîos on or by the way; see -ode2, -eum

proctodeal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

proctodeum proc·to·de·um or proc·to·dae·um (prŏk'tə-dē'əm)
n. pl. proc·to·de·ums or proc·to·de·a (-dē-ə) or proc·to·dae·ums or proc·to·dae·a (-dē-ə)
An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage. Also called anal pit.

The American Heritage® Stedman's Medical Dictionary
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