| Haber-Weiss reaction | The reaction of superoxide (O2-- with hydrogen peroxide to produce molecular oxygen (O2), hydroxide radical (OH-), and OH-; often, iron catalyzed; a source of oxidative stress in blood cells and various tissues. (05 Mar 2000) |
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| haberdasher | 1. A dealer in small wares, as tapes, pins, needles, and thread; also, a hatter. "The haberdasher heapeth wealth by hats." (Gascoigne) 2. A dealer in drapery goods of various descriptions, as laces, silks, trimmings, etc. Origin: Prob. Fr. Icel. Hapurtask trumpery, trifles, perh. Through French. It is possibly akin to E. Haversack, and to Icel. Taska trunk, chest, pocket, G. Tasche pocket, and the orig. Sense was perh, peddler's wares. Source: Websters Dictionary (01 Mar 1998) |
| Habermann, R | <person> German dermatologist, 1884-1941. See: Mucha-Habermann disease, Mucha-Habermann syndrome. (05 Mar 2000) |
| habit | <botany> The growth form of a plant, comprising its size, shape, texture and orientation. (09 Oct 1997) |
| habit chorea | <clinical sign> An involuntary compulsive, repetitive, stereotyped movement, resembling a purposeful movement because it is coordinated and involves muscles in their normal synergistic relationships, tics usually involve the face and shoulders. (18 Nov 1997) |
| habit scoliosis | Scoliosis supposedly due to habitual standing or sitting in an improper position. (05 Mar 2000) |
| habit spasm | <clinical sign> An involuntary compulsive, repetitive, stereotyped movement, resembling a purposeful movement because it is coordinated and involves muscles in their normal synergistic relationships, tics usually involve the face and shoulders. (18 Nov 1997) |
| habit tic | A habitual repetition of some grimace, shrug of the shoulder, twisting or jerking of the head, or the like. (05 Mar 2000) |
| habitan | Same as Habitant. "General met an emissary . . . Sent . . . To ascertain the feelings of the habitans or French yeomanry." (W. Irwing) Source: Websters Dictionary (01 Mar 1998) |
| habitat | <ecology, zoology> The physical location or type of environment in which an organism or biological population lives or occurs. The place occupied by an organism, population, or community. It is the physical part of the community structure in which an organism finds its home, and includes the sum total of all the environmental conditions present in the specific place occupied by an organism. Often a habitat is defined to include a whole community of organisms. (09 Oct 1997) |
| habitat component | <ecology> A single element (for example, velocity, depth, cover, etc.) of the habitat or environment in which a fish or other aquatic species or population may live or occur. (09 Oct 1997) |
| habitat type | <ecology> A land or aquatic unit, consisting of an aggregation of habitats having equivalent structure, function, and responses to disturbance. (09 Oct 1997) |
| habits | Acquired or learned responses which are regularly manifested. (12 Dec 1998) |
| habitual | <psychology> Of the nature of a habit, according to habit, established by or repeated by force of habit, customary. (18 Nov 1997) |
| habitual abortion | A condition in which a woman has had three or more consecutive, spontaneous abortion's. (05 Mar 2000) |