Definition of "tussock" [tus•sock]

• A clump or tuft, as of growing grass. (noun)
• A tuft of hair or feathers. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The houses are thatched with a reed-like grass called tussock, which is grown in the gardens or on a piece of ground near."
• "I think one of the plants that makes the hummocks might be this plant called tussock sedge carex stricta."
• "Ireland, is mimicked in a wonderful manner by one of the Liparidae (the family to which our common "tussock" and "vapourer" moths belong)."