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Definition of Undulate

Undulate: To have a wavy border or form. Also, to rise and fall like a wave. For example, the border of a wound may undulate, as may the edge of a rash. And sound waves may undulate.

The word "undulate" comes from the Latin "undula" which is the diminutive of "unda" meaning wave. So "undula" is a little wave. The adjective is "undulant."

Undulant fever, also called brucellosis, is an infectious disease characterized by a rising and falling (undulant) fever. It is caused by a bacterium called Brucella that can be transmitted in unpasteurized milk or cheese of cattle, sheep, and goats or by contact with diseased animals.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=15643
Last Editorial Review: 6/14/2012

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