Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A fine-grained, light-colored igneous rock, composed chiefly of feldspar and quartz.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fine grained volcanic extrusive rock, generally light in color, composed of felsic minerals.
  • n. Any light-colored volcanic rock whose true mineralogy is not yet determined.

from the GNU version of the Collaborative International Dictionary of English

  • n. A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz.

from The Century Dictionary and Cyclopedia

  • n. A compact, very hard rock, almost flinty in texture. made up of quartz and orthoclase feldspar intimately mixed.

Etymologies

fels(par) + -ite1.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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