third ventricle n.
A narrow, vertically oriented cavity in the midplane below the corpus callosum that communicates with each of the lateral ventricles through the interventricular foramen.
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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a fool or simpleton; ninny. |
| third ventricle | |
noun | |
| a narrow ventricle in the midplane below the corpus callosum; communicates with the fourth ventricle via the Sylvian aqueduct |