buttonlip
nounUK /ˈbʌtənlɪp/
US /ˈbʌtənlɪp/
A buttonlip is a person whose lips are small and round like a button.
The little boy with the buttonlip smiled at the camera.
OTHER MEANINGS
2. A nickname for someone who keeps their lips pressed tightly together.
Everyone called the quiet old man Buttonlip because he never spoke.
3. A small, round lip or rim on an object, such as a button or fastener.
The buttonlip on the jar lid kept it sealed tight.
4. A term of endearment for a child with cute, small lips.
Come here, my little buttonlip, and give me a kiss.