/ Dictionary / Index M miller's-thumb: Meaning and Definition of Find definitions for: mill•er's-thumb Pronunciation: (mil'urz-thum'), [key] — n. any of several small, freshwater sculpins of the genus Cottus, of Europe and North America. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: miller's-thumb (Thesaurus) millerite Milles 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