the.com/nostril
two doorways that take turns breathing while you forget they exist
means One of the two external openings of the nose through which you breathe and smell.
from From Old English 'nosthyrl,' a plain compound of 'nosu' (nose) and 'thyrel' (a hole or piercing) — so a nostril is literally a 'nose-hole.' That same 'thyrel' survives, worn down, in 'thrill,' which once meant to pierce. Your nose, then, is quietly perforated by the same word that now means excitement.
nasal cyclenostrils alternate dominance every few hours automatically
separate streamseach nostril smells slightly different things simultaneously
flare powercontrolled by muscles humans barely consciously use
air filterhairs and mucus trap dust before lungs