conchoidal

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con·choi·dal

(kon-koy'dăl),
Shaped like a shell; having alternate convexities and concavities on the surface.
[concha + G. eidos, appearance]
Farlex Partner Medical Dictionary © Farlex 2012

conchoidal

(kŏng-koy′dăl) [″ + eidos, form, shape]
Shell-shaped.
Medical Dictionary, © 2009 Farlex and Partners

con·choi·dal

(kŏn-koydăl)
Shaped like a shell; having alternate convexities and concavities on the surface.
[concha + G. eidos, appearance]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Platforms on bending-initiated flakes made by direct percussion are, in fact, the point of interface of the two surfaces that would make up the axes of the platform angle (as per Fig 3.15.1) in a flake produced through conchoidal fracture. The flake produced by a bending fracture tears away from the core behind the point of impact, whereas on a conchoidally produced flake, the platform lies between the point of impact and the dorsal surface of the flake.
It is brittle with a conchoidal fracture, and has a good cleavage parallel to {001} and no observable parting.
Crystals are brittle and possess a good {100} cleavage and conchoidal fracture. The Mohs hardness is about 2 1/2.
While the flakes share characteristics - such as sharp edges and conchoidal fractures - with hominin stone tools, they are not used as such by the monkeys.