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Webster's Dictionary (1865)

Flŭ'or, n.

noun

n. [Lat., from fluere, to flow; Fr. fluor.]

  1. A fluid state. [Obs.] Newton.
  2. Menstrual flux; catamenia; menses. [Obs.]
  3. (Min.) Fluoride of calcium, called also fluor-spar. It commonly occurs massive, but crystallizes in octahedrons, which are frequently changed, as the crystallization proceeds, into cubes. It is a mineral of beautiful colors, and much used for ornamental vessels. Dana.