second set rejectionmedical dictionary

An accelerated rejection of a transplant that occurs when an individual has been previously sensitised to the graft.

(05 Mar 2000)

second sightmedical dictionary

1. <ophthalmology> Improved near vision in the aged as a result of increased refractivity of the nucleus of the lens causing myopia.

Synonyms: senile lenticular myopia.

2. The power of discerning what is not visible to the physical eye, or of foreseeing future events. Such as are of a disastrous kind, the capacity of a seer or prophetic vision.

(01 Mar 1998)

second signaling systemmedical dictionary

<psychology> Pavlovian term for speech in which words are considered to be the second signals capable of producing conditioned responses.

(05 Mar 2000)

second soundmedical dictionary

Preferred term: second heart sound

second-stability regionmedical dictionary

<radiobiology> A high pressure region where the plasma becomes stable to the pressure-gradient-driven ballooning instability.

The plasma is stable in the limit of small pressure gradients, becomes unstable at some intermediate pressure, and then becomes stable again at still higher pressures. Tokamaks operating in the second-stability region would be more attractive because the higher pressures (beta) would provide more fusion reactivity per unit volume of plasma, allowing smaller reactors to be built.

(09 Oct 1997)

second stage of labourmedical dictionary

<obstetrics> The part of labour from the full dilatation of the cervix until the baby is completely out of the birth canal. The second stage of labour is also called the stage of expulsion.

(12 Dec 1998)

second-system effectcomputing dictionary

(Sometimes, more euphoniously, "second-system syndrome") When one is designing the successor to a relatively small, elegant, and successful system, there is a tendency to become grandiose in one's success and design an elephantine feature-laden monstrosity. The term was first used by Fred Brooks in his classic "The Mythical Man-Month. It described the jump from a set of nice, simple operating systems on the IBM 70xx series to OS/360 on the 360 series. A similar effect can also happen in an evolving system; see Brooks's Law, creeping elegance, creeping featurism.

See also: Multics, OS/2, X, software bloat.

[Jargon File]

(01 Jul 2002)