Zu·lu (zo?o?lo?o)n. pl. Zulu or Zu·lus 1. A member of a Bantu people of southeast Africa, primarily inhabiting northeast Natal province in South Africa.2. The Nguni language of this people, closely related to Xhosa.Zu?lu adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.