Lus"trous*ly

from The Collaborative International Dictionary of English v.0.48

Lustrous \Lus"trous\, a. [Cf. F. lustreux. See 3d {Luster}.]
   Bright; shining; luminous. " Good sparks and lustrous."
   --Shak. -- {Lus"trous*ly}, adv.
   [1913 Webster]