D defs.my
Entry 1 sense Webster, 1913

Bitter spar

/bĭt'-ẽr spär/ · Bit·ter spar · IPA
01 A common name of dolomite; -- so called because it contains magnesia, the soluble salts of which are bitter. See Dolomite.
  1. 1.
    A common name of dolomite; -- so called because it contains magnesia, the soluble salts of which are bitter. See Dolomite. See: Dolomite