tortoiseshell

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tortoiseshell 

Material used in the manufacture of spectacle frames. It is obtained from the shell plates of the hawksbill turtle. See plastic spectacle frame; spectacles.

tortoiseshell

a coat color in cats consisting of a mixture of black and shades of red to yellow, usually broken into large patches. The color can be found in a variety of cats, both long- and shorthaired, and specific breeds, such as Burmese. Tortoiseshell-and-white is another variety, called calico in the USA and chintz in the United Kingdom. Because the genes for black and orange (including shades from red to yellow) are carried on an X chromosome, but not the same one, only females can carry both colors. Males from similar breeding are either orange or black. There are isolated examples of tortoiseshell or tortoiseshell-and-white male cats, but almost all are sterile due to the chromosomal abnormality of XXY. These are considered models of the human condition, klinefelter's syndrome. Rarely, the phenomenon may be attributed to somatic mutations, crossing over of chromosomes or mosaicism.
References in periodicals archive ?
The various colors include shades of black and gray so you don't have to conform to the traditional tortoise shell colors.
The most popular frame materials that are in huge demand these days are: tortoise shell and wood.
Janet Cummings Tower Road, Rugby||I WOULD like to thank Peter, in Eastern Green, for educating me about the small tortoise shell butterfly I found in my back garden.
Tara Lane, tortoise shell calico cat found, no collar.
Michibata also wore a pair of tortoise shell sunglasses and had her hair loose around her shoulders.
The strings of the kanun are plucked with fingerpicks made of tortoise shell or horn plectra which extend from each index finger and are held in place by circular metal bands.
There is a homeopathic medicine made from tortoise shell (Testudo), which we had prepared by Hahnemann Laboratories some years ago for a patient.
The Technological Residence, Traditional Living, or TRTL, is pronounced "turtle" and, in fact, resembles a tortoise shell.
The shiny gold aviators, geek-worthy tortoise shell bridges and clear frames with soft pink lenses are the perfect take on the styles that have defined cool for decades.
ORIGINATING from circa 1910, this is a diamond-shaped veneer mother of pearl and tortoise shell card case.
JIMMY CHOO tortoise shell sunglasses, $295 * Cicada, 307 S.
Also included in the set is a tortoise shell style brush with the NOCC's signature teal color bristle pad.