| overstory | Overstory is the larger, taller trees of growth which occupies a forest area and shades young trees, hardwoods, brush, and other deciduous varieties which are growing beneath the larger trees (i.e., understory). (09 Oct 1997) |
|---|---|
| overt homosexuality | Homosexual inclinations consciously experienced and expressed in actual homosexual behaviour. (05 Mar 2000) |
| overthwart | Across; from alde to side of. "Huge trees overthwart one another." 1. Having a transverse position; placed or situated across; hence, opposite. "Our overthwart neighbors." 2. Crossing in kind or disposition; perverse; adverse; opposing. "Overthwart humor." Source: Websters Dictionary (01 Mar 1998) |
| Overton, Charles | <person> German biologist in Sweden, 1865-1933. See: Meyer-Overton rule, Meyer-Overton theory of narcosis. (05 Mar 2000) |
| overtone | Any of the tones, other than the lowest or fundamental tone, of which a sound is composed. (05 Mar 2000) |
| overturning moment | <radiobiology> Torque (moment) on a toroidal field coil in a tokamak, about the device's radial direction, that results from out-of-plane forces on the coil due to the interactions between the coil current and the poloidal (vertical) magnetic field. This torque tends to overturn the vertical toroidal field coil, and must be engineered against. (09 Oct 1997) |
| overvalued idea | An exaggerated notion, belief, or delusion that persists, despite evidence to the contrary, and controls the mind, the obstinate conviction of a psychotic person regarding the correctness of his delusion. Synonym: idee fixe, overvalued idea, permanent dominant idea. (05 Mar 2000) |
| overventilation | A state in which there is an increased amount of air entering the pulmonary alveoli (increased alveolar ventilation), resulting in reduction of carbon dioxide tension and eventually leading to alkalosis. (18 Nov 1997) |
| overweight | Obesity. Please see MedicineNet site on OBESITY for information. (12 Dec 1998) |
| overwintering | Persistence of an infectious agent in its vector for extended periods, such as the cooler winter months, during which the vector has no opportunity to be reinfected or to infect another host. (05 Mar 2000) |
| ovi- | Egg. See: oo-, ovo-. Origin: L. Ovum (05 Mar 2000) |
| ovicapsule | 1. <anatomy> The outer layer of a Graafian follicle. 2. <zoology> Same as Ootheca. (06 Mar 1998) |
| ovicell | <zoology> One of the dilatations of the body wall of Bryozoa in which the ova sometimes undegro the first stages of their development. Source: Websters Dictionary (01 Mar 1998) |
| ovicidal | Causing death of the ovum. Origin: ovi-+ L. Caedo, to kill (05 Mar 2000) |
| ovicyst | <zoology> The pouch in which incubation takes place in some Tunicata. Source: Websters Dictionary (01 Mar 1998) |