Dictionary:

lustrous

  (lŭs'trəs)

1. Having a sheen or glow.
2. Gleaming with or as if with brilliant light; radiant. See synonyms at bright.

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adjective

1. Having a high, radiant sheen: glassy, gleaming, glistening, glossy, polished, shining, shiny. See light/darkness.
2. Giving off or reflecting light readily or in large amounts: beamy, bright, brilliant, effulgent, incandescent, irradiant, lambent, lucent, luminous, radiant, refulgent, shiny. See light/darkness.

Definition: glossy, shining
Antonyms: dark, dull, matte, unshiny

The adjective has 3 meanings:

Meaning #1: made smooth and bright by or as if by rubbing; reflecting a sheen or glow
  Synonyms: bright, burnished, shining, shiny

Meaning #2: brilliant

Meaning #3: reflecting light
  Synonyms: glistening, glossy, sheeny, shiny, shining