Cartilaginous
Cartilaginous , adjective
[Latin cartilaginosus: compare French cartilagineux.]
1.
Of or pertaining to cartilage; gristly; firm and tough like cartilage.
2.
(Zoology) Having the skeleton in the state of cartilage, the bones containing little or no calcareous matter; said of certain fishes, as the sturgeon and the sharks.