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Ethmoidal

(Science: anatomy) like a sieve; cribriform.

Pertaining to, or in the region of, the ethmoid bone.

(Science: anatomy) ethmoid bone, a bone of complicated structure through which the olfactory nerves pass out of the cranium and over which they are largely distributed.

Origin: gr. Like a sieve; sieve _ from: cf. F. Ethmoide, ethmoidal.