Plural form referring to multiple ethmoid bones, or contexts discussing the paired structures and various parts of the ethmoid bone.
From ethmoid (Greek ethmos, sieve + eidos, form) + -s (plural). Standard medical pluralization of a singular bone name.
While we technically have only one ethmoid bone, anatomy texts use 'ethmoids' to discuss its many structures and functions—it's so complex with its many chambers and surfaces that talking about the 'parts' of the ethmoid feels like talking about multiple bones.
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