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Webster 1913 Edition

Adj.

[Cf. F.

conchoïdal

(Min.)

Having elevations or depressions in form like one half of a bivalve shell; – applied principally to a surface produced by fracture.

Adj.

In mineralogy, resembling a conch or marine shell; having convex elevations and concave depressions, like shells; as a conchoidal fracture.