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Definition of Ethmoid bone
1. Noun. 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.
Medical Definition of Ethmoid bone
1. An irregularly shaped bone lying between the orbital plates of the frontal and anterior to the sphenoid bone; it consists of two lateral masses of thin plates enclosing air cells, attached above to a perforated horizontal lamina, the cribriform plate, from which descends a median vertical or perpendicular plate in the interval between the two lateral masses; the bone articulates with the sphenoid, frontal, maxillary, lacrimal, and palatine bones, the inferior nasal concha, and the vomer; it enters into the formation of the anterior cranial fossa, the orbits, and the nasal cavity. Synonym: os ethmoidale. (05 Mar 2000)
Lexicographical Neighbors of Ethmoid Bone
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