nostrils is a form of:

Nostril



noun
1.
(one of two openings of nose) រន្ធច្រមុះ
2.
(វេជ្ជសាស្ត្រ) រន្ធច្រមុះ
ENGLISH MEANING
noun
1.
One of the external openings of the nose, which give passage to the air breathed and to secretions from the nose and eyes; one of the anterior nares.
2.
Perception; insight; acuteness.