Definitions:
a person or thing that reduces a shock or that forms a barrier between incompatible or antagonistic people or things

a solution which resists changes in ph when acid or alkali is added to it.

a temporary memory area in which data is stored while it is being processed or transferred, especially one used while streaming video or downloading audio

lessen or moderate the impact of (something)

treat with a chemical buffer

store (data) in a buffer while it is being processed or transferred

an elderly man who is considered to be foolishly old-fashioned, unworldly, or incompetent