D defs.my
Entry 1 sense Webster, 1913

Tysonite

· Ty·son·ite · IPA
01 n. A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.
  1. 1.
    A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.(Min.) See: Fluocerite