Word Origin & History
1311, "mollusk," from O.Fr. coquille "a blister, shell, cockle," alt. by infl. of cock, from L. conchylium, from Gk. konkhylion "little shellfish," from konkhe "mussel, conch." Phrase cockles of the heart (1669) is perhaps from similar shape, or from L. corculum, dim. of cor "heart." Unrelated O.E. coccel
was the name of a flowering weed that grows in wheatfields and was used in M.E. to translate the Bible word now usually given as tares. It is in no other Gmc. language and may be from a dim. of L. coccus "grain, berry."