conchoidal adjective. [kɒŋ'kɔɪd(ǝ)l] M17.
[formed as CONCHOID + -AL¹.]
1. Math. Pertaining to or resembling a conchoid. M17.

2. Geology. Designating or displaying a fracture (of a rock or mineral) characterized by smooth shell-like convexities and concavities. E19.

■ conchoidally adverb in a conchoidal form L19.

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