dēductōrĭus — Lewis & Short
dēductōrĭus, a, um, adj.id.,
I of or for drawing off or draining (post-class.):
medicamenta,aperient, purgative, Cael. Aur. Acut. 2, 19:
cuniculus (in stabulis),Veg. Vet. 1, 56. Also subst.: deducto-rium, ii, n., a drain:
liquoris,Pall. Nov. 7, 21.