WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / A / atrial fibrillation atrial fibrillation noun 19 letters Scrabble 23 WWF 28 Definitions noun fibrillation of the muscles of the atria of the heart Look “atrial fibrillation” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →