nostril

its nostrils were clotted with blood.

narial Referring to the nostrils or olfactory organ.

Her nostrils flared with anger.

a skirt that flares from the waist; nostrils that flared with anger.

if you have a nosebleed, try packing the nostrils with cotton wool.

These are usually lateral on the nostrils and anterolateral to the excurrent apertures, but may be anterior to the excurrent apertures only.

internasal valve A fleshy flap extending between the nostrils and partly covering the mouth of rays.