undulant adjective. ['ʌndjʊlǝnt] M19.
[from UNDULATE verb, perh. after French ondulant: see -ANT¹.]
Rising and falling like waves, undulating, fluctuating.
undulant fever Medicine brucellosis in humans, which can lead to chronic intermittent fever and chiefly affects the reticuloendothelial system.

■ undulancy noun (rare) wavelike motion E20.

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