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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a fool or simpleton; ninny. |
mesencephalon mes·en·ceph·a·lon (měz'ěn-sěf'ə-lŏn', měs'-)
n.
The portion of the vertebrate brain that develops from the middle section of the embryonic brain. Also called midbrain.