/ Dictionary / Index C Cerro Tololo Inter-American Observatory: Meaning and Definition of Find definitions for: Cer'ro To•lo'lo Inter-Amer'ican Observ'atory Pronunciation: (ser'ō tu-lō'lō Sp. ser'rô tô-lô'lô), [key] an astronomical observatory in the Chilean Andes having a 156-in. (4-m) reflecting telescope. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Cerro Gordo cert. Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language