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A plural of stoma.
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.
n., pl. sto•ma•ta (ˈstoʊ mə tə, ˈstɒm ə-, stoʊˈmɑ tə) sto•mas.
1. a minute opening in leaves, stems, etc., through which gases are exchanged.
2. a primitive mouth or simple ingestive organ of an invertebrate animal.
3. a surgical opening in an organ constructed to permit passage of fluids or waste products to another organ or to the outside of the body.
[1675–85; < New Latin < Greek stóma mouth]
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