Drops are placed in each nostril and a suction bulb pulls mucus out of the nose.
From the chron.com
The position tracked was the midpoint between the openings of the nostril tubes.
From the nature.com
Every one or two seconds he has got a finger darting up one nostril or another.
From the telegraph.co.uk
The two prongs partly enclose the giant nostril characteristic of this species.
From the sciencedaily.com
All were being fed liquid nutrients through a tube inserted into their nostril.
From the usatoday.com
Finally, the crossed nostril experiments were also repeated in this new paradigm.
From the nature.com
The left nostril block is on the left, the right nostril block is on the right.
From the nature.com
Martin Johnson, forehead fully extended, tie removed and in nostril flexing mode.
From the guardian.co.uk
Close only your right nostril with your thumb, and slowly exhale and then inhale.
From the orlandosentinel.com
More examples
Either one of the two external openings to the nasal cavity in the nose
Either of the two orifices located on the nose (or on the beak of a bird); used as a passage for air and other gases to travel the nasal passages
(Nostrils) paired openings in the nose where air passes
(Nostrils) As in humans, birds have paired, external openings to their respiratory systems known as nostrils (or nares). They open into passages in the skull and ultimately lead to the windpipe (trachea). ...
Where the nasal cavity opens into the upper jaw.
A piercing done through the nostril. Should never be pierced with a piercing gun!