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

  • adjective Having no mouth or oral opening.

from The Century Dictionary.

  • Not possessing a mouth; specifically, belonging or pertaining to the Astomata.
  • In botany, without an aperture; specifically, without stomata or breathing-pores.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Not possessing a mouth.

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

  • adjective biology Having no mouth.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective having no mouth or mouthlike opening


from Wiktionary, Creative Commons Attribution/Share-Alike License

a- +‎ Ancient Greek στόμα (stoma, "mouth") (genitive στόματος (stomatos)) +‎ -ous.


  • The pupae of the Cirripedia (Figure 57), which are likewise astomatous, agree completely in all these parts with those of the Rhizocephala, even to the minutest details of the segmentation and bristling of the natatory feet; * they are especially distinguished from them by the possession of a pair of composite eyes.

    Facts and Arguments for Darwin

  • Rhizocephala, being astomatous, cannot of course live long as Nauplii, and in the course of only a few days they become transformed into equally astomatous "pupae," as Darwin calls them.

    Facts and Arguments for Darwin

  • The Rhizocephala remain astomatous; they lose all their limbs completely, and appear as sausage-like, sack-shaped or discoidal excrescences of their host, filled with ova (Figures 59 and 60); from the point of attachment closed tubes, ramified like roots, sink into the interior of the host, twisting round its intestine, or becoming diffused among the sac-like tubes of its liver.

    Facts and Arguments for Darwin

  • Nauplius-like form, inasmuch as the plump, oval, astomatous body bears two pairs of simple rowing feet, and behind these, as traces of the third pair, two inflations furnished each with a long seta, but that beneath this Nauplius-skin a very different larva lies ready prepared, which in a few hours bursts its clumsy envelope and then makes its appearance in a form "which agrees in the segmentation of the body and in the development of the extremities with the first Cyclops-stage"

    Facts and Arguments for Darwin


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