Definitions

1. adjective

having a wavelike or undulating motion; having or characterized by a low, unsteady fever that rises and falls in a wavelike manner, typically due to a recurring infection, such as brucellosis.

“The undulant motion of the water created a soothing melody as it lapped against the shore.”

2. noun

a type of fever characterized by a recurring rise and fall in temperature.

“The patient’s undulant fever persisted for several weeks before finally subsiding.”