Noun, pl. fundi
1. An anatomical term referring to the portion of an organ opposite from its opening. (wikipedia.org)
2. The large, hollow part of an organ farthest from an opening; especially
a. the top, hollow portion of the uterus and
b. the back, interior part of the eye: the retina and associated blood vessels, etc.
c. the uppermost curve of the stomach
3. The base of a hollow organ or that part of the organ farthest from its opening. (wordnetweb.princeton.edu)
4. The bottom or base of any hollow organ; as, the fundus of the bladder; the fundus of the eye. (biology-online.org)
Word origin: Latin fundus for “bottom”