Inhalation is the drawing of air, or of something else, into the lungs. The breath in.
It is the formal partner of exhalation and belongs to medicine and to safety warnings, where smoke inhalation is a specific and often fatal injury, and inhalation of fumes is what a label warns against. There is a treatment sense, since a steam inhalation is an old remedy for a blocked nose. The verb is inhale, which everyday English uses far more than the noun.
1nouninhalationThe act of breathing something into the lungs.
“He was treated for smoke inhalation.”
Proto-Indo-European
*h₂enh₁-
Latin
inhalare — to breathe on (breathe in)
English
inhale
English, today
inhalation
Built from
From inhale + -ation. inhale comes from Latin inhalare (“to breathe on (breathe in)”), from in (“in, into, on”) + halare (“to breathe”).
Etymology from Wiktionary, CC BY-SA