kōˈkēnə, kəˈ- noun
( -s )
Etymology: Spanish, probably irregular diminutive of concha shell — more at concha
1. : a small marine clam of the genus Donax (especially D. variabilis ) used for broth or chowder
2. : a soft whitish limestone formed of broken shells and corals cemented together that is found in the southern United States and used for roadbeds and for building