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

  • adjective Impossible to break; indestructible.
  • adjective Physics That cannot be refracted.

from The Century Dictionary.

  • Not refrangible; not to be broken or violated.

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

  • adjective Not refrangible; that can not be refracted in passing from one medium to another.

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

  • adjective Not to broken or transgressed; inviolable.
  • adjective physics Incapable of being refracted.


Sorry, no etymologies found.


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  • adj. - that cannot or should not be broken; inviolable

    September 9, 2009