patois

/ˈpætwɑ/
noun
  1. A regional dialect or informal language that is not the standard form of a country, often spoken in a particular area or by a particular group.
    • The older villagers still speak a local patois that is hard for outsiders to understand.
    • The novel includes dialogue written in the rural patois of the region.
    • In Jamaica, many people speak a patois that mixes English with African language influences.
  2. The special vocabulary or jargon of a particular group or profession.
    • The medical patois used by doctors can be confusing to patients.
    • Surfers have their own patois for describing waves and weather conditions.
    • Computer programmers often use a patois full of acronyms and technical terms.
Antonyms
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