olfactory (adj) - of or pertaining to scent or the sense of smell [ol-fak-tuh-ree]
BREAKDOWN: OL- (smell, scent) + FACT- (to make) + -ORY (of or relating to)
olfaction is the sense of smell; the act or state of smelling
See also: malodorous, redolent
“You can look at things all your life and not see them really. This ‘seeing’ is, in a way, a ‘not seeing,’ if you follow me. It is more of a search for something, in which, being blindfolded, you develop the tactile, the olfactory, the auditory senses —and thus see for the first time.” —Henry Miller
I'm never happier about the phenomenon of olfactory fatigue than when I need to use an outhouse.