WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / P / prothrombin prothrombin noun /proʊθrɑmbɪn/ 3 syllables 11 letters Scrabble 20 WWF 23 Definitions noun a protein in blood plasma that is the inactive precursor of thrombin factor ii Look “prothrombin” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →