Definitions

1. adjective

relating to or resembling the ethmoid bone, which is a spongy bone in the skull that contains the nasal cavity’s superior air passages.

“The ethmoidal cells of the respiratory tract played a crucial role in filtering the air we breathe.”

2. noun

a cell or cavity in the ethmoid bone.

“The ethmoidal cells were filled with a thick, yellowish mucus that needed to be drained.”