shellbutton
nounUK /ˈʃelˌbʌtən/
US /ˈʃelˌbʌtən/
A shellbutton is a small round button made from a seashell.
She sewed a shiny shellbutton onto her favorite coat.
OTHER MEANINGS
2. A button-shaped piece of shell used in jewelry or decoration.
The necklace was strung with tiny shellbuttons.
3. A small shell-like knob or stud on a piece of equipment.
He pressed the shellbutton to start the machine.
4. A decorative button carved from abalone or oyster shell.
The antique dress had rare shellbuttons down the back.