tumor

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function; a neoplasm.
2. n. A swollen part; a swelling.

Century Dictionary and Cyclopedia

1. n. A swell or rise of any kind.
2. n. In medicine: A swelling; one of the four necessary accompaniments, according to the older pathologists, of inflammation—namely, color, dolor, rubor, et tumor (heat, pain, redness, and swelling).
3. n. An abnormal prominence existing upon any of the cutaneous, mucous, or serous surfaces in any part of the body, and not due to acute inflammation. A tumor is usually a new formation of tissue foreign to the part in which it exists, and is thus distinguished in general from hypertrophy, though a hypertrophy may occasionally be so localized as to constitute a true tumor. A neoplasm is called a tumor when it forms a prominence on any surface. A swelling may be acute or chronic, and may be circumscribed or diffuse; a tumor is a chronic circumscribed swelling.
4. n. A swelling port or style; tumidity; bombast.

Wiktionary

1. n. oncology, pathology An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia.

GNU Webster's 1913

1. n. (Med.) A morbid swelling, prominence, or growth, on any part of the body; especially, a growth produced by deposition of new tissue; a neoplasm.
2. n. rare Affected pomp; bombast; swelling words or expressions; false magnificence or sublimity.

WordNet 3.0

1. n. an abnormal new mass of tissue that serves no purpose