IPA: /ˈɡreɪniəst/
KK: /ˈɡreɪniɪst/
Having a rough texture or appearance due to the presence of small particles or grains; the most textured or rough in this way.
The grainiest sandpaper is best for smoothing rough surfaces.
Comparative: grainier
Superlative: grainiest
Grainiest → It is formed from "grain" (from Old French *grain*, meaning seed or small particle) and "-iest" (a superlative suffix indicating the most). The word "grainiest" means having the most grain or being the most textured with small particles.
Think of 'grain' as referring to small particles, and remember that 'grainiest' describes something that has the most of those small particles.