'uniform-grained' originates from English, specifically a compound of 'uniform' and 'grain', where 'uniform' ultimately derives from Latin 'uniformis' meaning 'one form' and 'grain' ultimately derives from Latin 'granum' meaning 'seed' or 'small particle'.

'uniform' came into English via Middle French/Latin 'uniformis' (medieval Latin), and 'grain' entered English via Old French 'graine' from Latin 'granum'; the compound 'uniform-grained' is a modern English descriptive compound combining these elements.

Initially, the components meant 'one form' (uniform) and 'seed/small particle' (grain); over time the compound evolved to describe materials whose particles or texture are consistently the same size or appearance ('having uniformly sized grains').