From The Collaborative International Dictionary of English v.0.48:
Irony \I"ron*y\, n. [L. ironia, Gr. ? dissimulation, fr. ? a
dissembler in speech, fr. ? to speak; perh. akin to E. word:
cf. F. ironie.]
[1913 Webster]
1. Dissimulation; ignorance feigned for the purpose of
confounding or provoking an antagonist.
[1913 Webster]
2. A sort of humor, ridicule, or light sarcasm, which adopts
a mode of speech the meaning of which is contrary to the
literal sense of the words.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Irony \I"ron*y\, a. [From Iron.]
[1913 Webster]
1. Made or consisting of iron; partaking of iron; iron; as,
irony chains; irony particles; -- In this sense iron is
the more common term. [R.] --Woodward.
[1913 Webster +PJC]
2. Resembling iron in taste, hardness, or other physical
property.
[1913 Webster]