/ Dictionary / Index G guanaco: Meaning and Definition of Find definitions for: gua•na•co Pronunciation: (gwä-nä'kō), [key] — pl. -cos. a wild South American ruminant, Lama guanicoe, of which the llama and alpaca are believed to be domesticated varieties: related to the camels. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: guanaco (Thesaurus) Guanabara guanadrel Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language