ethmoid(n = noun.body) ethmoid bone - one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity;
ethmoid, a. [Gr. like a sieve; sieve + from: cf. F. ethmoïde, ethmoïdal.].
Like a sieve; cribriform. [1913 Webster]
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.