American Heritage Dictionary
(5)
Century Dictionary
GNU Webster's 1913
WordNet
(3)
Elsewhere on the web
The freaky-gorgeous one has what is called a tortoiseshell coat.— Rachel Lucas
Over the last century, millions have been killed for the tortoiseshell markets of Europe, the United States and Asia.— PhysOrg.com - latest science and technology news stories
Loved the big half-tortoiseshell, half-leather steering wheel.— Motoring
The small tortoiseshell is the labrador of the butterfly world: cheerful and content to live close to humans.— The Guardian World News

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