I just noticed this my own self earlier this a.m.; and I dashed off an email to UJ in response to his complaint that he couldn't find epicaricacy in any real dictionary (reading between the lines there) -- I straightened the record on that, I did.

from Nathan Bailey's "An Universal Etymological English Dictionary", which is a very olde dictionary indeed (1721):
Epicharikaky - from the Greek words or roots for "upon", "joy", and "evil": "A Joy at the Misfortunes of others".