Emily Dickinson Lexicon

JAR'GON, n. [Fr. jargon; It. gergo, gergone; Sp. xerga, jargon, and coarse frieze, serge.]

1. Confused, unintelligible talk or language; gabble; gibberish; cant. All jargon of the schools. – Prior.
2. A mineral, usually of a gray or greenish white color, in small irregular grains, or crystalized in quadrangular prisms surmounted with pyramids, or in octahedrons consisting of double quadrangular prisms. [See Zircon.] – Kirwan.