Definition of "Buffer" :

noun: an implement consisting of soft material mounted on a block; used for polishing (as in manicuring)

noun: a cushion-like device that reduces shock due to an impact

noun: a power tool used to buff surfaces

noun: (computer science) a part of RAM used for temporary storage of data that is waiting to be sent to a device; used to compensate for differences in the rate of flow of data between components of a computer system

noun: an inclined metal frame at the front of a locomotive to clear the track

noun: a neutral zone between two rival powers that is created in order to diminish the danger of conflict

noun: (chemistry) an ionic compound that resists changes in its pH

verb: add a buffer (a solution)

"Buffered saline solution for the eyes."

verb: protect from impact