P-Z

palpitation

Unduly rapid or throbbing heartbeat that is noted by a patient; it may be regular or irregular.
Undue awareness by a patient of a heartbeat that is otherwise normal.

paraesthesia

Abnormal sensation, as burning or prickling.

paralysis

Loss or impairment of motor function.

para-occupational exposure

Exposure of a worker's family to substances carried from the workplace to the home.
Exposure of visitors to substances in the workplace.

parasympatholytic

Producing effects resembling those caused by interruption of the parasympathetic nerve; also called anticholinergic.

parasympathomimetic

Producing effects resembling those caused by stimulation of the parasympathetic nervous system.
synonym cholinomimetic.

parenteral dosage

Method of introducing substances into an organism avoiding the gastrointestinal tract (subcutaneously, intravenously, intramuscularly, etc,},

paresis

Slight or incomplete paralysis.

particulate matter

(in atmospheric chemistry)

Note	The term aerosol is recommended to describe airborne particulate matter.

Particles in air, usually of a defined size and specified as PM ⁿ where n is the maximum aerodynamic diameter in jim of at least 50% of the particles.

partition coefficient

Ratio of the distribution of a substance between two phases when the heterogeneous system of two phases is in equilibrium.

Note	The ratio of concentrations (or, strictly speaking, activities) of the same molecular species in the two phases is constant at constant temperature.

Note	The octanol/water partition coefficient is often used as a measure of the BCF for modelling purposes.

Note

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Fundamental Toxicology