Used as comb. form of FLUORINE, before vowels. Fluor-apatite, Min. (see quot.). Fluorhydric [+ HYDR(-OGEN) -IC.] acid, Chem., hydrofluoric acid (HF).
1882. Dana, Min. & Lithol. (ed. 4), 213. When chlorine is present in place of fluorine it is called chlor-apatite, and when the reverse, fluor-apatite.
1864. Watts, Dict. Chem., II. 669. Fluorhydric or Hydrofluoric acid.
