| intrapartum period | In obstetrics, the period from the onset of labour to the end of the third stage of labour. (05 Mar 2000) |
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| 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) |
| eclipse period | The time between infection by (or induction of) a bacteriophage, or other virus, and the appearance of mature virus within the cell; an interval of time during which viral infectivity cannot be recovered. Synonym: eclipse phase. (05 Mar 2000) |
| effective refractory period | The period during which impulses may appear but are too weak to be conducted; the longest interval between adequate stimuli, falling just short of the time necessary to allow a propagated response to be evoked in a tissue by the second stimulus; it differs from the functional refractory period in that it is a measure of stimulus interval rather than response interval of time. (05 Mar 2000) |
| ejection period | The period in the cardiac cycle when the semilunar valves are open and blood is being ejected from the ventricles into the arterial system. Synonym: ejection period. (05 Mar 2000) |
| total refractory period | The absolute refractory period plus the relative refractory period. (05 Mar 2000) |
| trenton period | <geology> A subdivision in the lower Silurian system of America; so named from Trenton Falls, in new York. The rocks are mostly limestones, and the period is divided into the Trenton, Utica, and Cincinnati epochs. Source: Websters Dictionary (01 Mar 1998) |
| extrinsic incubation period | Time required for the development of a disease agent in a vector, from the time of uptake of the agent to the time when the vector is infective. (05 Mar 2000) |
| fertile period | The period in a regularly menstruating woman's cycle, during which conception is most likely. (05 Mar 2000) |
| latency period | <psychology> The period from about 5 to 7 years to adolescence when there is an apparent cessation of psychosexual development. (12 Dec 1998) |
| latent period | A seemingly inactive period, as that between exposure of tissue to an injurious agent and the manifestation of response or that between the instant of stimulation and the beginning of response. (18 Nov 1997) |