n. 1.an ionic compound that resists changes in its pH 2.an inclined metal frame at the front of a locomotive to clear the track 3.(computer science) a part of RAM used for temporary storage of data that is waiting to be sent to a device 4.a power tool used to buff surfaces 5.a cushion-like device that reduces shock due to contact 6.an implement consisting of soft material mounted on a block buffer v. 1.add a buffer (a solution) 2.protect from impact