NOUN (1)

1. the clear liquid that lies above a sediment or precipitate;


ADJECTIVE (1)

1. of a liquid; floating on the surface above a sediment or precipitate;
- Example: "the supernatant fat was skimmed off"

The Collaborative International Dictionary of English v.0.48:

Supernatant \Su`per*na"tant\, a. [L. supernatanus, p. pr. of
   supernatare to swim above; super above + natare to swim.]
   Swimming above; floating on the surface; as, oil supernatant
   on water.
   [1913 Webster]
   [1913 Webster]

WordNet (r) 3.0 (2006):

supernatant
    adj 1: of a liquid; floating on the surface above a sediment or
           precipitate; "the supernatant fat was skimmed off"
    n 1: the clear liquid that lies above a sediment or precipitate