buffer

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

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

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

(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

a power tool used to buff surfaces

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

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

add a buffer (a solution); "buffered saline solution for the eyes"

protect from impact; "cushion the blow"