The Collaborative International Dictionary
Deletery
Deletery \Del"e*ter*y\, a. [LL. deleterius: cf. F.
d['e]l['e]t[`e]re.]
Destructive; poisonous. [Obs.] ``Deletery medicines.''
--Hudibras.
Deletery
Deletery \Del"e*ter*y\, n. That which destroys. [Obs.]
They [the Scriptures] are the only deletery of
heresies.
--Jer. Taylor.
Wiktionary
deletery
a. (context obsolete English) destructive, poisonous. n. (context obsolete English) That which destroys.