uncinate process of ethmoid bone
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un·ci·nate pro·cess of eth·moid bone[TA]
a sickle-shaped process of bone on the medial wall of the ethmoidal labyrinth below the middle concha; it articulates with the ethmoidal process of the inferior concha and partly closes the orifice of the maxillary sinus.
Synonym(s): processus uncinatus ossis ethmoidalis [TA]