| Gregarina | A genus of sporozoan protozoa (phylum Apicomplexa, subclass Gregarinia), parasitic in annelids and arthropods, and lacking schizogony and endodyogeny in the life cycle. Origin: L. Gregarius, gregarious, fr. Grex (greg-), a flock (05 Mar 2000) |
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| gregarinae | <zoology> An order of Protozoa, allied to the Rhizopoda, and parasitic in other animals, as in the earthworm, lobster, etc. When adult, they have a small, wormlike body inclosing a nucleus, but without external organs; in one of the young stages, they are amoebiform. Synonym: Gregarinida, and Gregarinaria. Origin: NL, fr. Gregarina the typical genus, fr. L. Gregarius. See Gregarious. Source: Websters Dictionary (01 Mar 1998) |
| gregarine | <zoology> Of or pertaining to the Gregarinae. One of the Gregarinae. Source: Websters Dictionary (01 Mar 1998) |
| gregarine movement | <biology, microbiology> Peculiar gliding movement shown by gregarines (Protozoa), the mechanism of which is poorly understood. (18 Nov 1997) |
| Gregarinia | A sporozoan subclass consisting of a number of parasites of the body cavity and intestinal tract of invertebrates, especially annelids and arthropods; typical genera include Gregarina in insects and Monocystis in earthworms. (05 Mar 2000) |
| gregarinosis | A disease due to the presence of gregarines. (05 Mar 2000) |
| gregarious | Habitually living or moving in flocks or herds; tending to flock or herd together; not habitually solitary or living alone. "No birds of prey are gregarious." (Ray) 2. (of people) enjoying companionship; sociable; not solitary. 3. (of plants) growing in clusters. Grega"riously, Gre-ga'ri-ous-ness. Origin: L. Gregarius, fr. Grex, gregis, herd; cf. Gr. To assemble, Skr. Jar to approach. Cf. Congregate, Egregious. Source: Websters Dictionary (01 Mar 1998) |
| Gregor Mendel | <person> An Austrian monk and botanist. His breeding experiments on garden peas and subsequent formulation of the laws of heredity formed the basis for the field of genetics. Lived: 1822-1884. (13 Nov 1997) |
| gregorian | Pertaining to, or originated by, some person named Gregory, especially one of the popes of that name. Gregorian calendar, the calendar as reformed by Pope Gregory XIII. In 1582, including the method of adjusting the leap years so as to harmonize the civil year with the solar, and also the regulation of the time of Easter and the movable feasts by means of epochs. See Gregorian year (below). <medicine> Gregorian chant, a form of reflecting telescope, named from Prof. James Gregory, of Edinburgh, who perfected it in 1663. A small concave mirror in the axis of this telescope, having its focus coincident with that of the large reflector, transmits the light received from the latter back through a hole in its center to the eyepiece placed behind it. Gregorian year, the year as now reckoned according to the Gregorian calendar. Thus, every year, of the current reckoning, which is divisible by 4, except those divisible by 100 aud not by 400, has 366 days; all other years have 365 days. See Bissextile, and Note under Style. Origin: NL. Gregorianus, fr. Gregorius Gregory, Gr., cf. F. Gregorien. Source: Websters Dictionary (01 Mar 1998) |
| Greig's syndrome | <syndrome> Extreme width between the eyes, mental retardation may be associated. (27 Sep 1997) |
| Greig, David | <person> Scottish physician, 1864-1936. See: Greig's syndrome. (05 Mar 2000) |
| greillade | <chemistry> Iron ore in coarse powder, prepared for reduction by the Catalan process. Source: Websters Dictionary (01 Mar 1998) |
| greisen | <chemical> A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony. Source: Websters Dictionary (01 Mar 1998) |
| grenada | An island of the west indies. Its capital is st. George's. It was discovered in 1498 by columbus who called it concepcion. It was held at different times by the french and the british during the 18th century. The british suppressed a native uprising in 1795. It was an associate state of great britain 1967-74 but became an independent nation within the british commonwealth in 1974. The original name referred to the feast of the immaculate conception but it was later renamed for the spanish kingdom of granada. (12 Dec 1998) |
| grenade | <chemical> A hollow ball or shell of iron filled with powder of other explosive, ignited by means of a fuse, and thrown from the hand among enemies. Hand grenade. A small grenade of iron or glass, usually about two and a half inches in diameter, to be thrown from the hand into the head of a sap, trenches, covered way, or upon besiegers mounting a breach. A portable fire extinguisher consisting of a glass bottle containing water and gas. It is thrown into the flames. Called also fire grenade. Rampart grenades, grenades of various sizes, which, when used, are rolled over the pararapet in a trough. Origin: F. Grenade a pomegranate, a grenade, or Sp. Granada; orig, filled with seeds. So called from the resemblanse of its shape to a pomegranate. See Carnet, Grain a kernel, and cf. Pomegranate. Source: Websters Dictionary (01 Mar 1998) |