n. pl. sur·ger·ies
1. The branch of medicine that deals with the diagnosis and treatment of injury, deformity, and disease by the use of instruments.
a. Treatment based on such medicine, typically involving the removal or replacement of diseased tissue by cutting: The athlete had surgery on his knee.
b. A procedure that is part of this treatment; an operation: The doctor performed three surgeries this morning.
3. An operating room or a laboratory of a surgeon or of a hospital's surgical staff: How long has the patient been in surgery?
4. Chiefly British
a. A physician's, dentist's, or veterinarian's office.
b. The period during which a physician, dentist, or veterinarian consults with or treats patients in the office.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.