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; used to compensate for differences in the rate of flow of data between components of a computer system
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; used for polishing (as in manicuring)