A member of a congregation of hermits named after Saint Jerome: A hieronymite was a fellow member of a medieval religious order called Hermits of St. Jerome.

A common name for three or four congregations of hermits living according to the rule of St. Augustine: There were also supplementary regulations taken from St Jerome's writings included in the hermits' congregations, or Hieronymites:

Their habit, or clothing, of the hermits was white, with a black cloak.