The Collaborative International Dictionary
Irrision
Irrision \Ir*ri"sion\, n. [L. irrisio, fr. irridere, irrisum, to laugh at; pref. ir- in + ridere to laugh: cf. F. irrision.] The act of laughing at another; derision.
This being spoken sceptic[`e], or by way of irrision.
--Chapman.
Wiktionary
irrision
n. (context obsolete English) The act of laughing at another; derision.