Hypertext Webster Gateway: "Purring"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pur \Pur\, v. i. [imp. & p. p. {Purred}; p. pr. & vb. n.
{Purring}.] [Of imitative origin; cf. Prov. G. purren.]
To utter a low, murmuring, continued sound, as a cat does
when pleased. [Written also {purr}.]
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