nostrils; wings of the nose
Refers to the fleshy outer part of the nostrils, often used in expressions like 小鼻を膨らませる (flare one's nostrils) or 小鼻がかゆい (itchy nostrils).
See also: 鼻翼
He flared his nostrils proudly.
花粉で小鼻がかゆい。
My nostrils are itchy from pollen.
Compound of 小 (small) and 鼻 (nose), literally 'small nose', referring to the nostrils.