skull and crossbones

noun
a representation of a front view of a human skull above two crossed bones, originally used on pirates' flags and now used as a warning sign, as in designating substances as poisons.

Origin:
1820–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
skull and crossbones
 
n
a picture of the human skull above two crossed thighbones, formerly on the pirate flag, now used as a warning of danger or death

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

skull and crossbones n. pl. skulls and crossbones
A representation of a human skull above two long crossed bones, a symbol of death used as a warning label on poisons.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

skull and crossbones definition


A picture or outline of a human skull and two crossed arm or leg bones. Pirate ships are supposed to have used the skull and crossbones on their flags. (See also Jolly Roger.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
They've got the skull and crossbones and everything.
But as researchers screen more and more substances, a dizzying number emerge
  from the lab festooned with skull and crossbones.
Never drink anything with a skull and crossbones picture on the label.
The billboard features a picture of hot dogs in a cigarette pack inscribed with
  skull and crossbones.
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