Pronunciation: (gu-ril'u), [key]
1. the largest of the anthropoid apes, Gorilla gorilla, terrestrial and vegetarian, of western equatorial Africa and the Kivu highlands, comprising the subspecies G. g. gorilla (western lowland gorilla), G. g. graueri (eastern lowland gorilla), and G. g. beringei (mountain gorilla): now rare.
2. an ugly, brutish person.
3. Slang.a hoodlum or thug, esp. one who threatens or inflicts violence.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.