/ Dictionary / Index L Los Altos: Meaning and Definition of Find definitions for: Los Al•tos Pronunciation: (lôs- al'tus, los), [key] a city in W California. 25,769. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Los Alamos Los Angeleno Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language