fundus

/ˈfʌn.dəs/noun
Middle School
1

The top, hollow portion of the uterus.

2

The back, interior part of the eye, accommodating the retina and associated blood vessels, etc.

3

The uppermost hollow of the stomach, which in humans forms a bulge above where the oesophagus enters the stomach.

4

The deepest part of a sulcus, such as of the sulci of the human cerebral cortex.