How to spell tambourine

Tutoring English, spelling is always interesting. The tutor mentions the spelling of the word tambourine.

tambourine (noun):
a hand-held drum with metallic noisemakers attached.

The Brits and the Yanks both spell tambourine this way.

Source:

Gilmour, Lorna (editor). Collins Essential Canadian English Dictionary and Thesaurus. Glasgow: HarperCollins, 2006.

Mish, Frederick C. The Merriam-Webster Dictionary. Springfield: Merriam-Webster, 2004.