teratoma

A teratoma is a type of neoplasm (specifically, a tumor). The word teratoma comes from Greek and means roughly "monstrous tumor". Definitive diagnosis of a teratoma is based on its histology: a teratoma is a tumor with tissue or organ components resembling normal derivatives of all three germ layers. Rarely, not all three germ layers are identifiable. The tissues of a teratoma, although normal in themselves, may be quite different from surrounding tissues, and may be highly inappropriate, even grotesque (hence the monstrous): teratomas have been reported to contain hair, teeth, bone and very rarely more complex organs such as eyeball, torso, and hand. Usually, however, a teratoma will contain no organs but rather one or more tissues normally found in organs such as the brain, thyroid, liver, and lung.
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Teratoma /ter·a·to·ma/ pl. terato´mata, teratomas a true neoplasm made up of different types of tissue, none of which is native to the area in [more]Teratoma - Community and Resources

Noun
1. a tumor consisting of a mixture of tissues not normally found at that site
(hypernym) tumor, tumour, neoplasm

n. teratoma

(n.)
A tumor, sometimes found in newborn children, which is made up of a heterigenous mixture of tissues, as of bone, cartilage and muscle.