/ Dictionary / Index L Lowell Observatory: Meaning and Definition of Find definitions for: Low'ell Observ'atory Pronunciation: [key] the astronomical observatory, situated in Flagstaff, Arizona, at which Pluto was discovered in 1930. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lowell low-end Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language