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an interlacing, twining, looping, etc., of a cord, rope, or the like, drawn tight into a knob or lump, for fastening, binding, or connecting two cords together or a cord to something else.

a piece of ribbon or similar material tied or folded upon itself and used or worn as an ornament.

a group or cluster of persons or things.

the hard, cross-grained mass of wood at the place where a branch joins the trunk of a tree.

a part of this mass showing in a piece of lumber, wood panel, etc.

Anatomy, Zoology.��a protuberance or swelling on or in a part or process, as in a muscle.

a protuberance in the tissue of a plant; an excrescence on a stem, branch, or root; a node or joint in a stem, especially when of swollen form.

any of various fungal diseases of trees characterized by the formation of an excrescence, knob, or gnarl.

an involved, intricate, or difficult matter; complicated problem.

Nautical.��

1. a unit of speed equal to one nautical mile or about 1.15 statute miles per hour.

2. a unit of 47 feet 3 inches (13.79 meters) on a logline, marked off by knots.

3. a nautical mile.

a bond or tie.

Also called joint, node.��Mathematics.��in interpolation, one of the points at which the values of a function are assigned.

to tie in a knot; form a knot in.

to secure or fasten by a knot.

to form protuberances, bosses, or knobs in; make knotty.

to become tied or tangled in a knot.

to form knots or joints.