形容詞 lustrous:

1. made smooth and bright by or as if by rubbing; reflecting a sheen or glow
   同義詞：bright, burnished, shining, shiny
2. brilliant
3. reflecting light
   同義詞：glistening, glossy, sheeny, shiny, shining

1. A smooth, lustrous, variously colored deposit, chiefly calcium carbonate, formed around a grain of sand or other foreign matter in the shells of certain mollusks and valued as a gem.
   珍珠在幾種軟體動物的貝殼中，圍繞著一粒沙子或其他外來物質(zhì)形成的一種光滑、有色澤、具有不同顏色且主要是碳酸鈣的沉積物，被珍視為寶石
2. The soft, thick, lustrous fur of this animal.
   貂皮這種動物的柔軟、濃密且有光澤的毛皮

lus.trous

adj.（形容詞）
Having a sheen or glow.
有光澤或光亮的
Gleaming with or as if with brilliant light; radiant.See Synonyms at bright
光輝的，杰出的：以或仿佛以亮光閃耀的；光輝的參見 bright

【引伸】
lus.trously
adv.（副詞）
lus.trousness
n.（名詞）