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also sto·mo·dae·um  (stō′mə-dē′əm)
n. pl. sto·mo·de·a also sto·mo·dae·a (-dē′ə)
The anterior or oral portion of the digestive tract of an embryo.

[New Latin : Greek stoma, mouth + Greek hodaios, on the way (from hodos, road).]

sto′mo·de′al (-dē′əl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˌstoʊ məˈdi əm, ˌstɒm ə-)

n., pl. -de•a (-ˈdi ə)
a depression in the ectoderm of the oral region of a young embryo, which develops into the mouth and oral cavity.
[1875–80; < New Latin < Greek stóm(a) stoma + hodaîon on the way]
sto`mo•de′al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
The human parotid gland (PG) is developed from an ectodermal proliferation of the stomodeum during the sixth week of prenatal development (Moore & Persaud, 2002).
Other visible structures are the stomodeum and the labrum, located in the central portion of the naupliar embryo.
The pharyngeal gut is separated from the stomodeum by the buccopharyngeal membrane.
During the larval stages, at the junction of the stomodeum with mesodeum, two pairs of caeca are present--an anterior pair formed by a simple tubule and a lateral pair with three lobes (Fig.
Neuroendocrine tumors would not be expected to occur in tissue derived from the primitive stomodeum.
Taxonomic value of the cuticular structures of the stomodeum in Acridomorpha.
The adenohypophysis, or anterior pituitary, is derived from an evagination of oral ectoderm of the dorsal median region of the stomodeum. The neurohypophysis, or posterior pituitary, is derived from an evagination of the infundibular portion of the diencephalon of the brain.
Ctenophores display features of bilateral symmetry around the oral-aboral axis: the flattened stomodeum defines the sagittal plane, and an orthogonal tentacular plane passes through the two tentacle pouches.
The stomodeum appeared at stage 13 and the prototrochal girdle with its cilia were completely formed during stage 14 (Fig.