| pulse period | The reciprocal of the repetition rate; e.g., the interval between leading edges of successive pulses. (05 Mar 2000) |
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| silent period | The time during which there is no electrical activity in a muscle following its rapid unloading, any pause in an otherwise continuous series of electrophysiologic events. (05 Mar 2000) |
| niagara period | <geology> A subdivision or the American Upper Silurian system, embracing the Medina, Clinton, and Niagara epoch. The rocks of the Niagara epoch, mostly limestones, are extensively distributed, and at Niagara Falls consist of about eighty feet of shale supporting a greater thickness of limestone, which is gradually undermined by the removal of the shale. See Chart of Geology. Source: Websters Dictionary (01 Mar 1998) |
| synthesis period | The period of the cell cycle when there is synthesis of DNA and histone; it occurs between Gap1 and Gap2. Synonym: S phase. (05 Mar 2000) |
| incubation period | <microbiology> The time from the moment of inoculation (exposure) to the development of the clinical manifestations of a particular infectious disease. (13 Nov 1997) |
| quarantine period | The time during which an infected individual or an area is kept isolated, avoiding contact with uninfected individuals; can be any specified period of time, varying with the disease in question. The term is derived from the Italian word for forty, since the period of isolation of individuals suspected of plague in the Middle Ages was forty days. (05 Mar 2000) |
| induction period | The period required for a specific agent to produce a disease; the interval from the causal action of a factor to initiation of disease, e.g., the interval between exposure to radiation and the onset of leukaemia; the interval between an initial injection of antigen and the appearance of demonstrable antibodies in the blood. (05 Mar 2000) |
| infectious period | <epidemiology> The time period during which infecteds are able to transmit an infection to any susceptible host or vector they contact. Note that the infectious period may not necessarily be associated with symptoms of the disease. (05 Dec 1998) |
| intraoperative period | The period during a surgical operation. (12 Dec 1998) |
| intrapartum period | In obstetrics, the period from the onset of labour to the end of the third stage of labour. (05 Mar 2000) |
| isoelectric period | The period occurring in the electrocardiogram between the end of the S wave and the beginning of the T wave during which electrical forces are acting in directions such as to neutralise each other so that there is no difference in potential under the two electrodes. (05 Mar 2000) |
| isometric contraction period | The time between closure of the atrioventricular valves and opening of the semilunar valves. (05 Mar 2000) |
| isometric period of cardiac cycle | That period in which the muscle fibres do not shorten although the cardiac muscle is excited and the pressure in the ventricles rises, extending from the closure of the atrioventricular valves to the opening of the semilunar valves (isovolumic constriction) or the reverse (isovolumic relaxation). (05 Mar 2000) |
| isometric relaxation period | Early ventricular diastole beginning with closure of the aortic and pulmonic valves and preceding opening of the atrioventricular valves. (05 Mar 2000) |
| oedipal period | In psychoanalysis, a stage in the psychosexual development of the child, characterised by erotic attachment to the parent of the opposite sex, repressed because of fear of the parent of the same sex; usually occurring between the ages of 3 and 6 years. Synonym: oedipal period. (05 Mar 2000) |