The Collaborative International Dictionary of English v.0.48:

Moonlit \Moon"lit`\, a.
   Illumined by the moon. "The moonlit sea." --Moore. "Moonlit
   dells." --Lowell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

moonlit
    adj 1: lighted by moonlight; "the moonlit landscape" [syn:
           moonlit, moony] [ant: moonless]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "moonlit":
   ablaze, aglow, alight, bathed with light, bespangled, brightened,
   candlelit, enlightened, firelit, gaslit, illuminated, in a blaze,
   irradiate, irradiated, lamplit, lanternlit, lighted, lightened,
   lit, lit up, luminous, spangled, star-spangled, star-studded,
   starlit, studded, sunlit, tinseled