any of several parts or organs of the mouth, as the labrum of a crustacean.
- hy·po·sto·mi·al, adjective
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How to use hypostome in a sentence
The supposed hypostome is exceedingly doubtful; it lies dorsad of the crushed glabellar skeleton.The Appendages, Anatomy, and Relationships of Trilobites | Percy Edward Raymond
They are characterized by the fact that the hypostome, or "tongue" (fig. 45) is large and file-like, roughened by sharp teeth.Handbook of Medical Entomology | William Albert Riley