Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of hypostoma is as below...

Manubrium :: Manubrium (n.) The proboscis of a jellyfish; -- called also hypostoma. See Illust. of Hydromedusa.

Hypostoma :: Hypostoma (n.) The lower lip of trilobites, crustaceans, etc..

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