noun
nostril; naris
Anatomical term for the external openings of the nose. Used in medical and formal contexts; in everyday speech, 鼻の穴 is more common.
医師は患者の鼻孔を検査した。
The doctor examined the patient's nostrils.
花粉が鼻孔から入り、くしゃみが出る。
Pollen enters through the nostrils and causes sneezing.