inhale
Concise Oxford English Dictionary © 2008 Oxford University Press:
inhale /ɪnˈheɪl/
▶verb breathe in (air, gas, smoke, etc.).
– derivatives
inhalation noun,
inhalational adjective.
inhalation noun,
inhalational adjective.
– origin C18 (earlier (C17) as inhalation): from L. inhalare ‘breathe in’.
'inhale' also found in these Oxford entries:

