ETYMOLOGY
from Latin derisorius, from derisor (derider, mocker) + -ous
EXAMPLE
“…And that therefore the Spirit of Prophecy foreseeing these times, whenas for such a space he called Rome Pergamus, this succeeding Scene coming on, he might very well change the title of Pergamus into that of Thyatira, with a derisorious Allusion to the occasion of the name of that City, from the news of a Daughter being born to Nicanor.…”
From: An Antidote Against Idolatry
By Henry More, 1664
Lexicophilia 