roucoulement

I'll leave you with their gentle “roucoulement” (cooing)

poireau - French Word-A-Day 2009

I'll leave you with their gentle “roucoulement” cooing

poireau - French Word-A-Day 2009

About her in the tall trees of the allee the percherons twittered while the soft roucoulement of the bees murmured drowsily in the tall calice of the chou-fleur.

The Hohenzollerns in America Stephen Leacock 1906

She rolled delicately about, like a very large, very pretty, and exceptionally graceful cat; she made fantastic gestures with her paws and tail; and she purred literally "as gently as any sucking dove" -- _roucoulement_ was the only word for it.

A History of the French Novel, Vol. 1 From the Beginning to 1800 George Saintsbury 1889

More familiar sounds are the _roucoulement_ of the pigeon and the tapping of the woodpecker.

To The Gold Coast for Gold, Vol. II A Personal Narrative Richard Francis Burton 1855