| teratogeny | <medicine> The formation of monsters. Origin: Gr, a wonder, monster + the root of to be born. Source: Websters Dictionary (01 Mar 1998) |
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| teratoid | Resembling a teras. Origin: G. Teratodes, fr. Teras (terat-), monster, + eidos, resemblance (05 Mar 2000) |
| teratoid tumour | <oncology, tumour> Malignant tumour (teratoma) thought to originate from primordial germ cells or misplaced blastomeres that contains tissues derived from all three embryonic layers, such as bone, muscle, cartilage, nerve, tooth buds and various glands. Accompanied by undifferentiated, pluripotent epithelial cells known as embryonal carcinoma cells. (16 Dec 1997) |
| teratologic | Pertaining to teratology. (18 Nov 1997) |
| teratological | Pertaining to teratology. (18 Nov 1997) |
| teratology | <embryology, study> The branch of embryology and pathology that deals with abnormal development and congenital malformations. (16 Dec 1997) |
| teratoma | <oncology, tumour> Malignant tumour (teratoma) thought to originate from primordial germ cells or misplaced blastomeres that contains tissues derived from all three embryonic layers, such as bone, muscle, cartilage, nerve, tooth buds and various glands. Accompanied by undifferentiated, pluripotent epithelial cells known as embryonal carcinoma cells. (16 Dec 1997) |
| teratoma orbitae | Unequal conjoined twins in which the parasite, usually very imperfectly developed, is attached at an orbit of the autosite. See: conjoined twins. Synonym: teratoma orbitae. Origin: L. Orbita, orbit, + G. Pagos, something fixed (05 Mar 2000) |
| teratoma, ovarian | Tumour that develops from a totipotential germ cell (a primary oocyte) retained within the egg sac (ovary). Being totipotential, that cell can give rise to all orders of cells necessary to form mature tissues and often recognizable structures such as hair, bone and sebaceous (oily) material, neural tissue and teeth. These tumours may occur at any age but the prime age of detection is in the childbearing years. The average age is 30. Up to 15% of women with ovarian teratomas have them in both ovaries. The tumours can range in size from a centimeter (less than a half inch) up to 45 cm (17 inches) in diameter. They can cause the ovary to twist (torsion) and imperil its blood supply. Although the large majority (about 98%) of ovarian teratomas are benign, the remaining fraction (about 2%) becomes malignant. The larger the ovarian teratoma, the greater the risk of rupture with spillage of the greasy contents which can create problems with adhesions, pain etc. Removal is usually the treatment of choice by laparotomy (surgery) or laparoscopy (with a scope). Ovarian teratomas are also called dermoid cysts of the ovary and referred to simply as dermoids. (12 Dec 1998) |
| teratomatous | Relating to or of the nature of a teratoma. (05 Mar 2000) |
| teratomatous cyst | A cyst containing structures derived from all three of the primary germ layers of the embryo. (05 Mar 2000) |
| teratophobia | <psychology> Morbid fear of carrying and giving birth to a malformed infant. Origin: terato-+ G. Phobos, fear (05 Mar 2000) |
| teratosis | An anomaly producing a teras. Synonym: teratism. Origin: terato-+ G. -osis, condition (05 Mar 2000) |
| teratospermia | Condition characterised by the presence of malformed spermatozoa in the semen. Origin: terato-+ G. Sperma, seed (05 Mar 2000) |
| terawatt | <radiobiology> One trillion (10^12) watts. (09 Oct 1997) |