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Definition of Undulatant

Undulatant: Having a wavy border or form. Also, rising and falling like a wave. For example, the border of a wound may be undulant, as may the edge of a rash. And sound waves may also be undulant.

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

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.medterms.com/script/main/art.asp?articlekey=16200
Last Editorial Review: 6/14/2012

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