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

  • noun Any of various pathological or traumatic changes in a bodily organ or tissue, including tumors, ulcers, sores, and wounds.
  • transitive verb To cause a lesion to form on or in.

from The Century Dictionary.

  • noun A hurting; hurt; wound; injury.
  • noun In civil law, the loss or injury suffered in a commutative contract by the party who does not receive an equivalent for what he gives.
  • noun In pathology, any morbid change in the structure of organs.

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

  • noun (Civil Law) Loss sustained from failure to fulfill a bargain or contract.
  • noun (Med.) Any morbid change in the exercise of functions or the texture of organs.

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

  • noun A wound or injury.
  • noun medicine An infected or otherwise injured or diseased organ or part, especially such patch of skin.
  • verb transitive To wound or injure, especially in an experiment or other controlled procedure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun an injury to living tissue (especially an injury involving a cut or break in the skin)
  • noun any localized abnormal structural change in a bodily part


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

[Middle English lesioun, from Old French lesion, from Latin laesiō, laesiōn-, from laesus, past participle of laedere, to injure.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English, from Middle French, from Latin laesiō ("injury"), itself from laesus, perfect passive participle of laedō ("I injure, hurt").


Help support Wordnik (and make this page ad-free) by adopting the word lesion.



Log in or sign up to get involved in the conversation. It's quick and easy.