eth·moid 
(ĕthmoid′) also eth·moi·dal (ĕth-moidl)
(ĕthmoid′) also eth·moi·dal (ĕth-moidl)adj.
Of, relating to, or being a light spongy bone located between the ocular orbits, forming part of the walls and septum of the superior nasal cavity, and containing numerous perforations for the passage of the fibers of the olfactory nerves.
n.
The ethmoid bone.
[French ethmoïde, from Greek ēthmoeidēs, sievelike : ēthmos, strainer (from ēthein, to sift) + -oeidēs, -oid.]