/ Dictionary / Index U Usumacinta: Meaning and Definition of Find definitions for: U•su•ma•cin•ta Pronunciation: ("s-mä-sēn'tä), [key] — n. a river in Central America, flowing NW along the W Guatemala-SE Mexico border, through Mexico, to the Gulf of Campeche. ab. 600 mi. (965 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. usufructuary Usumbura Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language