Definition of "ethmoid" [eth•moid]

• 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. (adjective)
• The ethmoid bone. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Again, a line drawn through the axis of the face, between the bones called ethmoid and vomer — the “basifacial axis” (‘f e’.) forms an exceedingly obtuse angle, where, when produced, it cuts the ‘basicranial axis.’"
• "In the cribriform plate of the ethmoid are the foramina for the olfactory nerves, and on the posterior part of the roof is the opening into the sphenoidal sinus."
• "Below the bulla ethmoidalis and hidden by the uncinate process of the ethmoid is the opening of the maxillary sinus (ostium maxillare); an accessory opening is frequently present above the posterior part of the inferior nasal concha."