teratoman.

1879 Amer. Jrnl. Med. Sci. 77 91 (heading) Extirpation of teratoma; or, teratoid tumor.

1879 Amer. Jrnl. Med. Sci. 77 93 To such tumors Virchow has applied the term teratoma.

1890 J. S. Billings National Med. Dict. II Teratoma, a tumor composed of various tissues or systems of tissue, as bone, teeth, etc., which do not normally exist at the place where the tumor grows.

1899 T. C. Allbutt et al. Syst. Med. VI. 100 Teratoma or dermoid cyst is another variety of dermoid tumour... It is affirmed that a teratoma never originates in the lung.

1906 Practitioner Nov. 663 A teratoma is defined as a growth that consists of elements represented in the developing ovum, whether at an early (e.g. syncytia, Langhans' cells, large mono-nuclear cells), or, at a later date (e.g. neuro-epithelial cutaneous, or other elements).

1948 R. A. Willis Pathol. Tumours lxi. 940 A teratoma is a true tumour or neoplasm composed of multiple tissues of kinds foreign to the part in which it arises.

1975 Nature 6 Nov. 12/1 Teratomas and teratocarcinomas are rare tumours which arise in the gonads, and contain a whole variety of differentiated tissues of ectodermal, mesodermal and endodermal origin (such as skin, nerve, muscle, cartilage, gut and lung), mixed together in a disorganised mass.

1979 Sci. Amer. Apr. 87/1 When all the embryonal cells differentiate into various kinds of normal tissue, the tumors stop growing: they are benign and are usually referred to simply as teratomas.

1891 in Cent. Dict.

1893 Index-Catal. Library Surgeon-General's Office, U.S. Army XIV. 896/1 (heading) Tumors (teratomatous).

1948 L. C. Martin & M. Hynes Clin. Endocrinol. ix. 193 A few arrhenoblastomata have been teratomatous, containing cartilage and other tissues.

1962 Punch 7 Nov. 658/2 A teratomatous growth of mixed tissues, probably of only low malignancy.