Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Fiat(noun) an authoritative command or order to do something; an effectual decree. 2  Fiat(noun) a warrant of a judge for certain processes. 3  Fiat(noun) an authority for certain proceedings given by the Lord Chancellor's signature.
HEAD LICE PRODUCTS. Our ClearLice lice treatment products will naturally get rid of lice from your head and home (clothing, bedding, furniture, carpets, and car interior) in just one day. ClearLice lice prevention products will help prevent lice from infesting your life.
While some early studies have suggested that tea tree oil, particularly when paired with lavender oil, may be effective in treating head lice, there are not enough large-scale, definitive studies to recommend tea tree oil as a treatment for lice.