tortoiseshell

American  

[tawr-tuhs-shel] / ˈtɔr təsˌʃɛl /

noun

1. a horny substance of a mottled brown and yellow coloration, composing the laminae that cover the inner body plates of the carapace of certain tortoises or turtles, especially the hawksbill, used for making combs and ornamental articles, inlaying, etc.

2. any synthetic substance made to look like natural tortoiseshell.

3. Also tortoiseshell butterfly any of several nymphalid butterflies of the genus Nymphalis, as N. californica, having variegated markings of red, yellow, or orange on the wings.

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adjective

1. mottled or variegated like tortoiseshell, especially with yellow and brown and sometimes other colors.

2. made of tortoiseshell.

tortoiseshell British  

/ ˈtɔːtəsˌʃɛl /

noun

1. a horny translucent yellow-and-brown mottled substance obtained from the outer layer of the shell of the hawksbill turtle: used for making ornaments, jewellery, etc

2. a similar synthetic substance, esp plastic or celluloid, now more widely used than the natural product

3. a breed of domestic cat, usually female, having black, cream, and brownish markings

4. any of several nymphalid butterflies of the genus Nymphalis, and related genera, having orange-brown wings with black markings

5. another name for hawksbill turtle

6. 1. a yellowish-brown mottled colour

   2. ( as adjective )

      a tortoiseshell décor

7. (modifier) made of tortoiseshell

   a tortoiseshell comb

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Etymology

Origin of tortoiseshell

First recorded in 1595–1605; tortoise + shell

Example Sentences

He was a scholarly analyst who wore tortoiseshell reading glasses and made friends throughout the energy industry.

From The Wall Street Journal • Dec. 17, 2025

The peacock and short tortoiseshell are among the first to spread their wings, with more butterflies emerging from April onwards.

From BBC • Apr. 25, 2025

The white-and-brown animal stands fish-eyed and proud beside Ebsen, who wears a subtly glamorous ensemble of bell-bottom jeans, dark V-neck tee, and tortoiseshell Prada sunglasses.

From Los Angeles Times • Apr. 9, 2025

As a result, tortoiseshell cats end up with separate patches of black and orange fur depending on which chromosome was inactivated in that part of their skin.

From Science Magazine • Nov. 27, 2024

The hall was decorated with ornate plasterwork, cabinets in precious woods and tortoiseshell and gold, statues of marble.

From "The Book of Dust: La Belle Sauvage" by Philip Pullman