buffer (Noun) — (chemistry) an ionic compound that resists changes in its pH.
buffer (Noun) — A neutral zone between two rival powers that is created in order to diminish the danger of conflict.
buffer (Noun) — An inclined metal frame at the front of a locomotive to clear the track.
buffer (Noun) — (computing) 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.
buffer (Noun) — A power tool used to buff surfaces.
buffer (Noun) — A cushion-like device that reduces shock due to an impact.
buffer (Noun) — An implement consisting of soft material mounted on a block; used for polishing (as in manicuring).
buffer (Noun) — (derogatory or affectionate) an amusingly eccentric, grumpy or old-fashioned old man.
buffer (Verb) — Add a buffer (a solution). ex. "buffered saline solution for the eyes"
buffer (Verb) — Protect from impact. ex. "buffer the blow"