- Removal and pathologic examination of specimens in the form of small pieces of tissue from the living body.
Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
- The removal of cells or tissues for examination under a microscope. When only a sample of tissue is removed, the procedure is called an incisional biopsy or core biopsy. When an entire lump or suspicious area is removed, the procedure is called an excisional biopsy. When a sample of tissue or fluid is removed with a needle, the procedure is called a needle biopsy or fine-needle aspiration.
Definition from: Physician Data Query via Unified Medical Language System at the National Library of Medicine
See also Understanding Medical Terminology.