Webster's English Dictionary

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coquina

co.qui.na \ko--'ke--n*\ n [Sp, prob. irreg. dim. of concha shell - more at 
   CONCHA] 1: a small marine clam (genus Donax) used for broth or chowder  2: 
   a soft whitish limestone formed of broken shells and corals cemented tog 
   ether and used for building