WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / S / serum serum noun 5 letters Scrabble 7 WWF 9 Definitions noun an amber, watery fluid, rich in proteins, that separates out when blood coagulates blood serum Look “serum” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →