mammillary body
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| Noun | 1. |  mammillary body - one of two small round structures on the undersurface of the brain that form the terminals of the anterior arches of the fornixneural structure - a structure that is part of the nervous system betweenbrain, diencephalon, interbrain, thalmencephalon - the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon |