Odorant \O"dor*ant\, a. [L. odorans, -antis, p. pr.]
Yielding odors; fragrant. --Holland.
[1913 Webster]
odorant \o"dor*ant\, n.
An odorous substance; especially, a substance with a strong
odor added to a dangerous substance, such as natural gas, to
provide an easy detection method and a warning; as, ethyl
mercaptan is used as an odorant in natural gas and propane to
facilitate detection of leaks.
[PJC]