'Thinned' definitions:

Definition of 'thinned'

From: WordNet
adjective
Mixed with water; "sold cut whiskey"; "a cup of thinned soup" [syn: cut, thinned, weakened]

Definition of 'Thinned'

From: GCIDE
  • Thin \Thin\, v. t. [imp. & p. p. Thinned; p. pr. & vb. n. Thinning.] [Cf. AS. ge[thorn]ynnian.] To make thin (in any of the senses of the adjective). [1913 Webster]