ethmoidal
Eth"moid, Eth*moid"al, a. Etym: [Gr. ethmoïde, ethmoïdal.] (Anat.) (a) Like a sieve; cribriform. (b) Pertaining to, or in the region of, the ethmoid bone. Ethmoid bone (Anat.), a bone of complicated structure through which the olfactory nerves pass out of the cranium and over which they are largely distributed.