[sahr-kaz-uh
m] 
| 1. | harsh or bitter derision or irony. |
| 2. | a sharply ironical taunt; sneering or cutting remark: a review full of sarcasms. |
| sar·casm (sär'kāz'əm) n.
[Late Latin sarcasmus, from Greek sarkasmos, from sarkazein, to bite the lips in rage, from sarx, sark-, flesh.] |
A form of irony in which apparent praise conceals another, scornful meaning. For example, a sarcastic remark directed at a person who consistently arrives fifteen minutes late for appointments might be, “Oh, you've arrived exactly on time!”