This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. superlative form of grainy: most grainy.

"When I ate "store" bread (after growing out of the Wonder Bread years and moving to university), I sought out the bag with the densest, grainiest, darkest loaf inside."