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ethmoid bone
eth·moid bone [ èth moyd bṓn ] (plural eth·moid bones)


noun 
Definition:
 
bone in front of skull: a perforated bone in the skull whose outer surfaces form part of the outer wall of the nasal cavity and the inner wall of the eye socket
[Mid-18th century. < Greek ēthmoeidēs "like a sieve" < ēthmos "sieve"]

eth·moid·al [ eth móyd'l ] adjective
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