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Webster's 1828 Dictionary

CONCHOIDAL

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

 

Webster's 1913 Dictionary

CONCHOIDAL

Con *choid "al, a. Etym: [Cf. F. conchoïdal.] (Min. )

 

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

 

New American Oxford Dictionary

conchoidal

con choi dal |käNGˈkoidl kɑŋˈkɔɪdl | ▶adjective chiefly Mineralogy denoting a type of fracture in a solid (such as flint or quartz ) that results in a smooth rounded surface resembling the shape of a scallop shell.

 

Oxford Dictionary

conchoidal

conchoidal |kɒŋˈkɔɪd (ə )l | ▶adjective chiefly Mineralogy denoting a type of fracture in a solid (such as flint ) which results in a smooth rounded surface resembling the shape of a scallop shell.