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 (ā-stŏm′ə-təs, ā-stō′mə-) also as·tom·ous (ăs′tə-məs) or a·stom·a·tal (ā-stŏm′ə-təl, ā-stō′mə-)
Having no mouth or oral opening.
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.


(æˈstɒmətəs; -ˈstəʊ-) ,




1. (Zoology) (of animals) having no mouth
2. (Botany) (of plants) having no stomata
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(eɪˈstɒm ə təs, eɪˈstoʊ mə-)

having no mouth, stoma, or stomata.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.astomatous - having no mouth or mouthlike openingastomatous - having no mouth or mouthlike opening
biological science, biology - the science that studies living organisms
stomatous - having a mouth or mouthlike opening
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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References in periodicals archive ?
lacustris produce astomatous leaves underwater but, if exposed, will initiate leaves with functional stomata (Keeley, unpubl, data).
They are evergreen with astomatous leaves and are the only extant terrestrial species of Tracheophyta lacking stomata.
Although comparatively rare, microstomatous and astomatous fishes have been observed for over a century (Leidy 1875; Dawson & Heal 1976).