Examples of knobbly

• I have vivid recollections of trying to take physical exercise in a playground like a mountain, rising one in 10, with a knobbly surface.

• More fluid basaltic lava flows tend to form flat sheet-like bodies, whereas viscous rhyolite lava flows forms knobbly, blocky masses of rock.

• The field was knobbly, and the airplane bounced and turned a somersault.

• The knobbly surface reflects sound waves that come through the spermaceti organ from the phonic lips.

• The holdfast is a large, hollow, knobbly structure.

• The margin is blunt, smooth at first but later becomes serrated and knobbly.

• The fruiting bodies are white, knobbly and relatively hard, requiring a fair amount of force to break.

• The bark is smooth and pale grey on young trees, becoming square-cracked and knobbly on old trees.