n. In playing musical instruments of the viol class, the wavy tone produced by oscillating or balancing the finger on a string that is being stopped.n. The act of undulating; a waving motion; fluctuation; in physics, wave-motion: as, the undulations of water or air or the ether.n. A wavy form; a form resembling that of a wave or waves; waviness.n. In pathology, a particular uneasy sensation of an undulatory motion in the heart.n. In surgery, a certain motion of the matter of an abscess when pressed, which indicates its fitness for opening.n. A set of waved lines; a surface so marked, or such an appearance; vermiculation; waviness.n. In geometry, the coming of a plane curve into a higher contact than usual with its tangent without contrary flexure.