/ Dictionary / Index A angstrom: Meaning and Definition of Find definitions for: ang•strom Pronunciation: (ang'strum), [key] — n. a unit of length, equal to one tenth of a millimicron, or one ten millionth of a millimeter, primarily used to express electromagnetic wavelengths. Symbol: Å; Abbr.: A &hasp;Also called Ång•ström Pronunciation: (ang'strum Swed. ông'strœm), [key] 1814–74, Swedish astronomer and physicist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: angstrom (Thesaurus) angst Anguier Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language