The Merriam-Webster Word of the Day for October 5, 2025, is "sonorous." This adjective describes something possessing a deep, loud, and pleasing sound. It can also refer to anything that produces sound when struck. Additionally, sonorous can describe something impressive in its effect or style. The example highlights a baritone's deep, sonorous voice commanding attention. A pipe organ's sonorous notes can enhance a sense of reverence in a cathedral. Historically, sonorous meant simply producing sound when struck, related to the Latin word for sound. However, it is typically reserved for deep, booming, or echoing sounds, not minor noises. The word is commonly applied to pleasant, deep, and loud voices or sounds. Because sonorous sounds often capture attention, the word also denotes an imposing or impressive quality in speech or writing.