Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The anterior or oral portion of the digestive tract of an embryo.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun anatomy A depression on the ectoderm of a developing embryo that becomes the mouth

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek στόμα ("mouth") + εἶδος ("likeness") + -um

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