uncinate process of ethmoid bone

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un·ci·nate pro·cess of eth·moid bone

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.
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References in periodicals archive ?
The hiatus semilunaris is inverted crescent shaped, bounded inferiorly by a sharp concave ridge produced by the uncinate process of the ethmoid bone, which leads upwards and forwards into a curved canal named the ethmoidal infundibulum.