: an adept in sarcasm: a sarcastic personThis was not meant to be a serious invention. But the smiley and its cousins succeeded where generations of misunderstood sarcasts had failed. —Megan Garber, Atlantic, 24 Apr. 2013
You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.