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The Collaborative International Dictionary
Teratoma

Teratoma \Ter`a*to"ma\, n. [NL., fr. Gr. ?, ?, monster + -oma.] (Med.) A tumor, sometimes found in newborn children, which is made up of a heterigenous mixture of tissues, as of bone, cartilage and muscle.

Wiktionary
teratoma

n. (context pathology English) A benign or malignant tumour, especially of the gonads, that arises from germ cells and consists of different types of tissue such as skin, hair, or muscle.

WordNet
teratoma

n. a tumor consisting of a mixture of tissues not normally found at that site

Wikipedia
Teratoma

A teratoma is a tumor with tissue or organ components resembling normal derivatives of more than one germ layer. Although the teratoma may be monodermal or polydermal (originating from one or more germ layers), its cells may differentiate in ways suggesting other germ layers. The tissues of a teratoma, although normal in themselves, may be quite different from surrounding tissues and may be highly disparate; teratomas have been reported to contain hair, teeth, bone and, very rarely, more complex organs or processes such as eyes, torso, and hands, feet, or other limbs.

Usually, a teratoma will contain no organs but rather one or more tissues normally found in organs such as the brain, thyroid, liver, and lung. Sometimes, the teratoma has within its capsule one or more fluid-filled cysts; when a large cyst occurs, there is a potential for the teratoma to produce a structure within the cyst that resembles a fetus. Because they are encapsulated, teratomas are usually benign, although several forms of malignant teratoma are known and some of these are common forms of teratoma. A mature teratoma is typically benign and found more commonly in women, while an immature teratoma is typically malignant and is more often found in men.

Teratomas are thought to be present at birth ( congenital), but small ones often remain undiscovered until much later in life.

Definitive medical diagnosis of a teratoma is based on its histology.

Usage examples of "teratoma".

I may venture to assert, though with all the inevitable reserves, of course, that it is not malignant, and that we are in the presence not of the tumour you mentioned, still less of a metastasis - God between us and evil - but of a splanchnic teratoma.

The complicated teratoma of this class may contain, in addition to the previously mentioned structures, cartilage and glands, mucous and serous membrane, muscle, nerves, and cerebral substance, portions of eyes, fingers with nails, mammae, etc.

After isolating the immortalizing traits from teratoma sources, I proposed that viral, retroviral, and even prion vectors might be engineered to transfer the selected traits into the human genome.

The seating was dead, exotic knotworks of malformed calcium teratomas harvested from a biocoral tank, all ribs and jawbones.

And did both of those peculiarities relate to Sebastian's earliest days, when as small children they had each wandered alone among the wild teratomas and devastated landscape of Earth's northern hemisphere?