English
grainflow
From grain + flow.
Proto-Indo-European *ǵerh₂- ‘to grow old, to mature’
…
Proto-Italic *grānom
Latin grānum ‘seed’
Old French grain
Middle English greyn ‘a grain’
English grain
Proto-Germanic *flōaną ‘to flow’
Proto-West Germanic *flōan ‘to flow’
Old English flōwan ‘to flow’
Middle English flowen
Middle English flowe
English flow
Today it means
noun The downhill flow of (typically sand) grains when forming a dune
Language periods are conventional ranges, not dates for this word.
Etymograph / grainflow