Ma?le?bo Pool? (m??le? bo?) n. a widening of the Zaire (Congo) River on the boundary between the Democratic Republic of the Congo and the People’s Republic of the Congo, about 330 mi. (530 km) from its mouth. ab. 20 mi. (32 km) long. Also called Stanley Pool. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.