† chalˈcanthous,a.Obs.rare—1. In 7 cal-. [f. as prec. + -ous.] Of the nature of ink or blacking. 1646Sir T. Browne Pseud. Ep. vi. xii. 337 A Calcanthous or Atramentous quality.1656Blount Glossogr., Calcanthous, pertaining to Shoomakers black or Vitriol.