[stoh-muh-dee-uhm, stom-uh-]
noun, plural stomodea [stoh-muh-dee-uh, stom-uh-] . Embryology.
a depression in the ectoderm of the oral region of a young embryo, which develops into the mouth and oral cavity.

1875–80; < Neo-Latin < Greek stóm(a) stoma + hodaîon (neuter singular) on the way; akin to -ode2

stomodeal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stomodaeum or stomodeum (ˌstəʊməˈdiːəm, ˌstɒm-, ˌstəʊməˈdiːəm, ˌstɒm-)
n , pl -daea, -dea
the oral cavity of a vertebrate embryo, which is formed from an invagination of the ectoderm and develops into the part of the alimentary canal between the mouth and stomach
[C19: from New Latin, from Greek stoma mouth + hodaios on the way, from hodos way]
stomodeum or stomodeum (ˌstəʊməˈdiːəm, ˌstɒm-, ˌstəʊməˈdiːəm, ˌstɒm-, -ˈdiːə)
[C19: from New Latin, from Greek stoma mouth + hodaios on the way, from hodos way]
stomo'daeal or stomodeum
stomo'deal or stomodeum

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

stomodeum sto·mo·de·um (stō'mə-dē'əm)
A midline ectodermal depression ventral to the embryonic brain and surrounded by the mandibular arch. It becomes continuous with the foregut and forms the mouth.

sto'mo·de'al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Four branchial grooves are present: the stomodeum is well-marked, and the bucco-pharyngeal membrane has disappeared.
The heart originally lies on the ventral aspect of the pharynx, immediately behind the stomodeum.
Thus, this rotation might be caused by the migration of these anterior segments around the stomodeum during development.
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