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 ?
In an even more surprising development, the scarce tortoiseshell - which as its name suggests is extremely rare - appeared in the UK for the first time since 1953.
The numbers of common blue (main), and small tortoiseshell butterflies in Britain are falling but the meadow brown (above) is faring better
The small tortoiseshell used to be just about the commonest butterfly, and you would see it every year in your garden, but it has become quite scarce," Dr Brereton said.
Oak veneered with ebony, ivory, tortoiseshell, pewter and brass.
Meanwhile, Jim pawns his treasured watch to purchase jeweled tortoiseshell combs for Della's precious tresses.
Tortoiseshell has been used for jewellery and personal adornment since the 17th century, when the Huguenots had developed their jewellery-making techniques but also included inlaid needlework cases, patch boxes and snuff boxes inlaid with precious metals.
I like tortoiseshell but Specsavers asked me to include two metal frames, as metal styles are bestsellers.
Adopting the 'if it ain't broke don't fix it' mantra he opted for a grey suit and contrasting waistcoat - plus tortoiseshell sunnies - to attend both the Topman Design show and the Burberry Prorsum show.
NICKY KELLY GWEN BROOK HILTON STEFANI Tortoiseshell Tortoiseshell Tortoiseshell glasses PS75 Uterque.
This is the highest ever ranking for the small tortoiseshell in the Big Butterfly Count - the world's largest annual insect citizen science survey.
THE small tortoiseshell butterfly has continued to fight back against long-term declines this year, an annual survey has revealed.