conlang

/ˈkɒn.læŋ/

IPA: /K AA1 N L AE1 NG/

noun
  1. 1

    A constructed language; a language that has been artificially constructed, such as Volapük, Esperanto, Quenya or Klingon.

    The Klingon language is a conlang created for use in Star Trek.

verb
  1. 1

    To make a constructed language.

    Brithenig was conlanged with the purpose of looking how Welsh might have developed if it were a Romance language.

Source: https://en.wiktionary.org/wiki/conlang