Etymology
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fundus (n.)

"bottom, depths; base of an organ," 1754, from Latin fundus "bottom" (see fund (n.)). In any general use it probably is extended from specific senses in anatomy.

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Definitions of fundus

fundus (n.)
(anatomy) the base of a hollow organ or that part of the organ farthest from its opening;
the uterine fundus
the fundus of the stomach
From wordnet.princeton.edu