According to Wikipedia: Anosmia (ænˈɒz.mi.ə) is a lack of functioning olfaction, or in other words, an inability to perceive smells. It can be either temporary or permanent.
Anosmia occurs in about 10% of head trauma injuries, and head trauma is a leading cause of anosmia in young adults. In older adults, the disorder is generally caused by viral infection.
The formation of numerous, closely spaced rills due to the uneven removal of surface soil by streamlets of running water. Also known as rilling; rill wash; rillwork.