Mineralogy producing smooth convexities or concavities, like those of a clamshell, when fractured: said of a brittle substance
Origin of conchoidal; from Classical Greek konchoeidēs (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)