Chudder
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The chudder is a type of feline vocalization used by tigers and domestic cats as a greeting. It has been described as a throaty trill or chuckle. The term is also used to describe similar sounds - for example, the uneven rumbling made by a roughly running engine, or the vocalizations of a pregnant cow.
[edit] Source
"On Communicating with Cats, Carla Helfferich. Alaska Science Forum 937, August 2, 1989.