nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A baleen whale (Megaptera novaeangliae) having a rounded back and long knobby flippers. Humpback whales communicate using complex, distinctive songs that identify individuals and play an important role in mating.