a. Biol. and Path. [f. Gr. τέρας, τερατ- (see TERATA) + -OID.] Having the appearance or character of a monster or monstrous formation; teratoid tumor = TERATOMA.
1876. Bristowe, The. & Pract. Med. (1878), 51. Tumours originating in proliferation, which he subdivides into histioid tumours,… organoid,… and teratoid, or those comprising a combination of organs.
1890. Billings, Nat. Med. Dict., Teratoid tumour, congenital tumour due to inclusion in one fœtus of portions of another.
