/ Dictionary / Index A autotransformer: Meaning and Definition of Find definitions for: au•to•trans•form•er Pronunciation: (ô"tō-trans-fôr'mur), [key] — n. Elect. a transformer having a single coil that serves as both a primary coil and a secondary coil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. autotoxin autotransfusion Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language