[1] : The Collaborative International Dictionary of English v.0.48

sun \sun\, v. t. imp.  p. p. sunned; p. pr.  vb. n.
   sunning.
   to expose to the sun's rays; to warm or dry in the sun; as,
   to sun cloth; to sun grain.
   1913 webster

         then to sun thyself in open air.         --dryden.
   1913 webster
see also:
sunned sunning 

[2] : WordNet (r) 2.0

sun
     n 1: a typical star that is the source of light and heat for the
          planets in the solar system; "the sun contains 99.85 of
          the mass in the solar system"
     2: the rays of the sun; "the shingles were weathered by the sun
        and wind" syn: sunlight, sunshine
     3: a person considered as a source of warmth or energy or glory
        etc
     4: any star around which a planetary system evolves
     5: first day of the week; observed as a day of rest and worship
        by most christians syn: sunday, lord's day, dominicus
     v 1: expose one's body to the sun syn: sunbathe
     2: expose to the rays of the sun or affect by exposure to the
        sun; "insolated paper may turn yellow and crumble"; "these
        herbs suffer when sunned" syn: insolate, solarize, solarise
     also: sunning, sunned
see also:
sunlight sunshine sunday lord's day dominicus sunbathe 
insolate solarize solarise sunning sunned 

[3] : WordNet (r) 2.0

sunning
     see sun
see also:
sun 

Sunning >> S Words
Sunning, definition of term: Sunning
sunning_pag1.html