fourth ventricle n.
An irregular cavity that extends from the obex to a communication with the sylvian aqueduct and is enclosed between the cerebellum dorsally and the tegmentum of rhombencephalon ventrally.
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| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| fourth ventricle | |
noun | |
| an irregular ventricle between the third ventricle and the central canal of the spinal cord |