/ Dictionary / Index B buttermilk sky: Meaning and Definition of Find definitions for: but'termilk sky' Pronunciation: [key] a cloudy sky resembling the mottled or clabbered appearance of buttermilk. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. buttermilk butter muslin Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language