Navel (noun)

1. The small depression in the middle of the abdomen, marking the point where the umbilical cord was attached to the fetus.
2. A small, round, protruding part, such as the center of a fruit.

Origin:

From old english nafela, of germanic origin; related to dutch navel and german nabel.

Examples:

1. She gently touched her baby's navel.
2. He had a tattoo of a flower on his navel.
3. The navel of the orange is the small protrusion where the stem was attached.
4. The navel of the apple is the small indentation at the bottom.
5. The navel of the watermelon is the small depression where the fruit was attached to the vine.