Mineralogy producing smooth convexities or concavities, like those of a clamshell, when fractured: said of a brittle substance
Origin of conchoidalfrom Classical Greek konchoeid?s (see conchoid) + -al
Of, relating to, or being a surface characterized by smooth, shell-like convexities and concavities, as on fractured obsidian.
Origin of conchoidalFrom Greek konkhoeidēs mussellike konkho- concho- -oeidēs -oid
(comparative more conchoidal, superlative most conchoidal)