1. either of the two openings in the nose through which air passes when breathing

Examples

• She could smell the flowers through her nostrils.
• The cold air made his nostrils flare.
• A small piece of tissue was stuck in her left nostril.
• The horse’s nostrils widened as it breathed heavily.
• He pinched his nostrils shut to avoid the bad smell.
• Steam came out of her nostrils in the cold weather.