A knot in wood; a large or hard knot, or a protuberance with twisted grain, on a tree.
Something resembling a knot in wood, such as in stone or limbs.
Gnarled, knotty, twisted.
To knot or twist something.
To snarl or growl; to gnar.
A bifurcation in the trunk of a tree giving rise to two roughly equal diameter branches.