tus·sock \ˈtəsə̇k, -sēk\noun (-s) Etymology: origin unknown 1. a.: a dense tuft (as of grass or hair) b.: a small hummock of more solid ground in marsh or bog usually covered with and bound together by the roots of low vegetation (as grasses or sedges) < raised tussocks of blueberries > < crossed the marsh by jumping from tussock to tussock > c.alsotussock landchiefly New Zealand: land covered with tussock grasses d.: tussock sedge 2.: tussock moth