† aciˈdoleous,a.Obs. [f. L. acid-us sour + ole-um oil + -ous.] An oily liquid of acid character, as vitriol. 1674Grew Anat. Plants iii. 2. iv. §15 A Rosin, is originally a Turpentine, or Acidoleous Liquor.1676Ibid. iii. ii. (1682) 259 Rosin and Mastick seem to be more purely acidoleous gums.