baleen whale

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several usually large cetaceans of the suborder Mysticeti, having two blowholes and whalebone plates instead of teeth, and including the humpback whale and the right whales.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of several large whales, of the suborder Mysticeti, that have plates of whalebone instead of teeth

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun whale with plates of whalebone along the upper jaw for filtering plankton from the water