| zodiacal | <astronomy> Of or pertaining to the zodiac; situated within the zodiac; as, the zodiacal planets. Zodiacal light, a luminous tract of the sky, of an elongated, triangular figure, lying near the ecliptic, its base being on the horizon, and its apex at varying altitudes. It is to be seen only in the evening, after twilight, and in the morning before dawn. It is supposed to be due to sunlight reflected from multitudes of meteoroids revolving about the sun nearly in the plane of the ecliptic. Origin: Cf. F. Zodiacal. Source: Websters Dictionary (01 Mar 1998) |
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| zoea | <zoology> A peculiar larval stage of certain decapod Crustacea, especially of crabs and certain Anomura. Alternative forms: zoaea. In this stage the anterior part of the body is relatively large, and usually bears three or four long spines. The years are conspicuous, and the antennae and jaws are long, fringed organs used in swimming. The thoracic legs are undeveloped or rudimentary, the abdomen long, slender, and often without appendages. The zoea, after casting its shell, changes to a megalops. Origin: NL, fr. Gr. Life. Source: Websters Dictionary (01 Mar 1998) |
| zoetic | <cell biology> Of or pertaining to life. (11 May 1997) |
| zoetrope | An optical toy, in which figures made to revolve on the inside of a cylinder, and viewed through slits in its circumference, appear like a single figure passing through a series of natural motions as if animated or mechanically moved. Origin: Gr. Life + turning, from to turn. Source: Websters Dictionary (01 Mar 1998) |
| zoic | <zoology> Of or pertaining to animals, or animal life. Origin: Gr. Source: Websters Dictionary (01 Mar 1998) |
| zoide | <biology> See Meride. Source: Websters Dictionary (01 Mar 1998) |
| zoisite | <chemical> A grayish or whitish mineral occurring in orthorhombic, prismatic crystals, also in columnar masses. It is a silicate of alumina and lime, and is allied to epidote. Origin: After its discoverer, Von Zois, an Austrian mineralogist. Source: Websters Dictionary (01 Mar 1998) |
| zoite | Synonym: sporozoite. Origin: G. Zoon, animal (05 Mar 2000) |
| zokor | <zoology> An Asiatic burrowing rodent (Siphneus aspalax) resembling the mole rat. It is native of the Altai Mountains. Source: Websters Dictionary (01 Mar 1998) |
| zolazepam | <chemical> 4-(2-fluorophenyl)-6,8-dihydro-1,3,8-trimethylpyrazolo(3,4-e)(1,4)diazepin-7(1h)-one. A pyrazolodiazepinone with pharmacological actions similar to anti-anxiety agents. It is commonly used in combination with tiletamine to obtain immobilization and anaesthesia in animals. Pharmacological action: sedatives, nonbarbiturate. Chemical name: Pyrazolo(3,4-e)(1,4)diazepin-7(1H)-one, 4-(2-fluorophenyl)-6,8-dihydro-1,3,8-trimethyl- (12 Dec 1998) |
| Zollinger, Robert | <person> U.S. Surgeon, *1903. See: Zollinger-Ellison syndrome, Zollinger-Ellison tumour. (05 Mar 2000) |
| Zollinger-Ellison syndrome | <syndrome> A tumour (gastrinoma) of the pancreatic islet cells that results in an over production of gastric acid, leading to fulminant ulceration of the oesophagus, stomach, duodenum and jejunum. Gastrinomas may also occur in the stomach, duodenum, spleen and regional lymph nodes. Treatment includes the use of H2 antagonists (for example cimetidine, ranitidine). Surgical excision of the tumour is curative in approximately 25% of patients. (27 Sep 1997) |
| Zollinger-Ellison tumour | A non-beta cell tumour of pancreatic islets causing the Zollinger-Ellison syndrome. (05 Mar 2000) |
| Zollner's lines | Figures devised to show the possibility of optical illusions; a common one consists of two parallel line's which are met by numerous short lines obliquely placed; the parallel lines then seeming to converge or diverge. (05 Mar 2000) |
| Zollner, Johann | <person> German physicist, 1834-1882. See: Zollner's lines. (05 Mar 2000) |