apiaceous,a.Bot.|eɪpɪˈeɪʃəs| [f.mod.L. Apiāce-æ, f.apium celery: see -aceous.] Of the family Apiaceæ or Umbelliferæ, containing such plants as celery, anise, hemlock; umbelliferous. 1839Penny Cycl. XIII. 6/1 The partial umbels of an apiaceous plant.1853in Mayne Exp. Lex.