supernatant
noun
su·per·na·tant ˌsü-pər-ˈnā-tᵊnt 
: the usually clear liquid overlying material deposited by settling, precipitation, or centrifugation
supernatant adjective
Word History
Etymology
Latin supernatant-, supernatans, present participle of supernatare to float, from super- + natare to swim — more at natant
First Known Use
1859, in the meaning defined above
Medical Definition
supernatant
noun
su·per·na·tant ˌsü-pər-ˈnāt-ᵊnt
: the usually clear liquid overlying material deposited by settling, precipitation, or centrifugation