crestal

adj

1. (not-comparable)That is situated on, or forms part of, a crest.

   “Microbial samples and peri-implant crestal bone levels of all implant sites were obtained before, during and after the breakdown period.”

noun

1. A scale located on the crest.

   “In the arrangement of the crestals Shinisaurus closely resembles Xenosaurus (in which genus, however, the crestals are blunt and resemble ornamental tack heads) […]”