undulation

Plural: undulations

Noun

• an undulating curve
• wavelike motion; a gentle rising and falling in the manner of waves
• (physics) a movement up and down or back and forth
• An instance or act of undulating.
• A wavy appearance or outline; waviness.
• A tremulous tone produced by a peculiar pressure of the finger on a string.
• A wavelike curve; a smooth and regular rise and fall.
• A wavelike motion of the air; electromagnetic radiation.
• A feeling as if of an undulatory motion about the heart.
• The distinctive motion of the matter within an abscess on being pressed when it is ripe for opening.

Synonyms

wave