Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Serving as a warning or signal of danger.

from The Century Dictionary.

  • Significant; indicative, as of danger; serving as a sign or warning; ominous; monitory; repugnatorial.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Significant; ominous; serving as a warning of danger; -- applied esp. to the warning colors or forms of certain animals.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective biology Acting as a sign of danger.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From Greek sēma, sēmat-, sign.]

Examples

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