conchoidal

adjective
con·choi·dal | \ käŋ-ˈkȯi-dᵊl , kän- \

Definition of conchoidal 

: having elevations or depressions shaped like the inside surface of a bivalve shell

Other words from conchoidal

conchoidally \käŋ-ˈkȯi-dᵊl-ē, kän- \ adverb

First Known Use of conchoidal

1666, in the meaning defined above

History and Etymology for conchoidal

Greek konchoeidēs like a mussel, from konchē

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The first known use of conchoidal was in 1666

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