ethmoid

(ĕth-moid'l)
adj.
Of, relating to, or being a light spongy bone located between the 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.]

(ĕth'moid') or eth·moi·dal (ĕth-moid'l)
adj.

Resembling a sieve.

n.

The ethmoid bone.

1. sievelike; cribriform.
2. the ethmoid bone.

• e. bone — the sievelike bone that forms a roof for the nasal fossae and part of the floor of the rostral cranial fossa.
• e. sinus — see concha.

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The noun has one meaning:

Meaning #1: 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
  Synonym: ethmoid bone

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