tortoiseshell
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 breed of domestic cat, usually female, having black, cream, and brownish markings
3. any of several nymphalid butterflies of the genus Nymphalis, and related genera, having orange-brown wings with black markings
5. a yellowish-brown mottled colour
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005