n. [ F., the same word as jargon. See Jargon a variety of zircon. ] 1. (Min.) A mineral consisting predominantly of zirconium silicate (Zr2SiO4) occurring in tetragonal crystals, usually of a brown or gray color. It consists of silica and zirconia. A red variety, used as a gem, is called hyacinth. Colorless, pale-yellow or smoky-brown varieties from Ceylon are called jargon. [ 1913 Webster +PJC ]

2. an imitation gemstone made of cubic zirconia. [ PJC ]

Zircon syenite, a coarse-grained syenite containing zircon crystals and often also elaeolite. It is largely developed in Southern Norway. [ 1913 Webster ]

n. [ NL. ] (Chem.) Zirconia. [ 1913 Webster ]

n. (Chem.) A salt of zirconic acid. [ 1913 Webster ]

n. [ NL. ] (Chem.) The oxide of zirconium (ZrO2), obtained as a white powder, and possessing both acid and basic properties. On account of its infusibility, and brilliant luminosity when incandescent, it is used as an ingredient of sticks for the Drummomd light. [ 1913 Webster ]

cubic zirconia. A colorless form of zirconia similar in appearance and refractivity to diamond, and used as a substitute for diamonds in inexpensive jewelry; -- also known by the acronym CZ. [ PJC ]

a. (Chem.) Pertaining to, containing, or resembling, zirconium; as, zirconic oxide; zirconic compounds. [ 1913 Webster ]

Zirconic acid, an acid of zirconium analogous to carbonic and silicic acids, known only in its salts. [ 1913 Webster ]

n. [ NL. ] (Chem.) A rare element of the carbon-silicon group, intermediate between the metals and nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr. Atomic weight, 90.4. [ 1913 Webster ]

. (Physics) A light, similar to the calcium light, produced by incandescent zirconia. [ Webster 1913 Suppl. ]

See Zirco-. [ 1913 Webster ]

n. [ Zircon + oid. ] (Crystallog.) A double eight-sided pyramid, a form common with tetragonal crystals; -- so called because this form often occurs in crystals of zircon. [ 1913 Webster ]