\Del"e*ter*y\, a. [LL. deleterius: cf. F.
d['e]l['e]t[`e]re.]
Destructive; poisonous. [Obs.] ``Deletery medicines.''
--Hudibras.

\Del"e*ter*y\, n.
That which destroys. [Obs.]
      They [the Scriptures] are the only deletery of
      heresies.                                --Jer. Taylor.