WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / S / sidereal hour sidereal hour noun /saɪdiriəlaʊr/ 4 syllables 13 letters Scrabble 16 WWF 17 Definitions noun 1/24 of a sidereal day Look “sidereal hour” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →