| local anaphylaxis | The immediate, transient kind of response that follows the injection of antigen (allergen) into the skin of a sensitised individual and is limited to the area surrounding the site of inoculation. See: skin test. (05 Mar 2000) |
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| artificial passive immunity | See: acquired immunity. (05 Mar 2000) |
| passive | Neither spontaneous nor active, not produced by active efforts. Origin: L. Passivus (18 Nov 1997) |
| passive agglutination | Agglutination of particles that have been coated with soluble antigen, by antiserum specific for the adsorbed antigen. Synonym: indirect agglutination. (05 Mar 2000) |
| passive-aggressive behaviour | Apparently compliant behaviour, with intrinsic obstructive or stubborn qualities, to cover deeply felt aggressive feelings that cannot be more directly expressed. (05 Mar 2000) |
| passive-aggressive personality | A personality disorder in which aggressive feelings are manifested in passive ways, especially through mild obstructionism and stubbornness. (05 Mar 2000) |
| passive-aggressive personality disorder | A personality disorder characterised by an indirect resistance to demands for adequate social and occupational performance; anger and opposition to authority and the expectations of others that is expressed covertly by obstructionism, procrastination, stubbornness, dawdling, forgetfulness, and intentional inefficiency. (12 Dec 1998) |
| passive atelectasis | The pulmonary collapse that occurs due to a space-occupying intrathoracic process such as pneumothorax or hydrothorax. (05 Mar 2000) |
| passive clot | A clot formed in an aneurysmal sac consequent to the cessation or slowing of circulation through the aneurysm. (05 Mar 2000) |
| passive congestion | Congestion caused by obstruction or slowing of the venous drainage, resulting in partial stagnation of blood in the capillaries and venules. (05 Mar 2000) |
| passive diffusion | See: facilitated transport. (05 Mar 2000) |
| passive duction | A manoeuver to determine whether a mechanical obstruction is present in the eye; with forceps grasping an eye muscle, an attempt is made to passively move the eyeball in the direction of restricted rotation. Synonym: passive duction. (05 Mar 2000) |
| passive eruption | The apparent continued eruption of the teeth, actually the result of regression of the gingivae and crestal bone. Polymorphous light eruption, a common pruritic papular eruption appearing in a few hours and lasting up to several days on skin exposed to shortwave ultraviolet light; subepidermal oedema and deep perivascular lymphocytic infiltration is seen microscopically. Eruption sequestrum, spicule of bone overlying the central occlusal fossa of an erupting permanent molar. Serum eruption, urticaria seen in serum sickness. Surgical eruption, the uncovering of an unerupted tooth to permit its further eruption into the oral cavity by surgically removing overlying soft tissue, bone, and sometimes teeth. (05 Mar 2000) |
| passive haemagglutination | A kind of passive agglutination in which erythrocytes, usually modified by mild treatment with tannic acid or other chemicals, are used to adsorb soluble antigen onto their surface, and which then agglutinate in the presence of antiserum specific for the adsorbed antigen. Synonym: indirect haemagglutination test. (05 Mar 2000) |
| passive hyperaemia | Hyperaemia due to an obstruction in the flow of blood from the affected part, the venous radicles becoming distended. Synonym: venous hyperaemia. (05 Mar 2000) |