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an interval or division of time; the time for the regular recurrence of a phenomenon.
absolute refractory period the part of the refractory period from phase 0 to approximately −60 mV during phase 3; during this time it is impossible for the myocardium to respond with a propagated action potential, even with a strong stimulus. Called also effective refractory period.
blanking period a period of time during and after a pacemaker stimulus when the unstimulated chamber is insensitive to avoid sensing the electronic event in the stimulated chamber.
effective refractory period absolute refractory period.
ejection period the second phase of ventricular systole (0.21 to 0.30 sec), between the opening and closing of the semilunar valves, while the blood is discharged into the aorta and pulmonary artery. Called also sphygmic period.
gestation period see gestation period.
incubation period see incubation period.
isoelectric period the moment in muscular contraction when no deflection of the galvanometer is produced.
latency period
latent period a seemingly inactive period, as that between exposure to an infection and the onset of illness (incubation period) or that between the instant of stimulation and the beginning of response (latency, def. 2).
refractory period the period of depolarization and repolarization of the cell membrane after excitation; during the first portion (absolute refractory period), the nerve or muscle fiber cannot respond to a second stimulus, whereas during the relative refractory period it can respond only to a strong stimulus.
relative refractory period the part of the refractory period from approximately −60 mV during phase 3 to the end of phase 3; during this time a depressed response to a strong stimulus is possible.
safe period the period during the menstrual cycle when conception is considered least likely to occur; it comprises approximately the ten days after menstruation begins and the ten days preceding menstruation. See the section on fertility awareness methods, under contraception.
sphygmic period ejection period.
supernormal period in electrocardiography, a period at the end of phase 3 of the action potential during which activation can be initiated with a milder stimulus than is required at maximal repolarization, because at this time the cell is excitable and closer to threshold than at maximal diastolic potential.
vulnerable period that time at the peak of the T wave during which serious arrhythmias are likely to result if a stimulus occurs.
Wenckebach's period a usually repetitive sequence seen in partial heart block, marked by progressive lengthening of the P–R interval; see also dropped beat.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. A certain duration or division of time.
See also: stage, phase.
2. One of the stages of a disease, for example, period of incubation, period of convalescence.
See also: stage, phase.
3. Colloquialism for menses.
4. Any of the horizontal rows of chemical elements in the periodic table.
[G. periodos, a way round, a cycle, fr. peri, around, + hodos, way]
Farlex Partner Medical Dictionary © Farlex 2012

menstrual flow

The endometrial tissue that sloughs monthly during menstruation, from menarche to menopause, which lasts for 2–7 days and ranges from 10 to 80 ml in volume.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


Vox populi A discrete time frame. See Accumulation period, Blanking period, Collection period, Critical period, Crystallization period, Eligibility period, Golden period, Grant budget period, Honeymoon period, Incubation period, Infectious period, Initial eligibility period, Last menstrual period, Latency period, NREMS period, Off period, Open enrollment period, Postoperative period, Pre-ejection period, Pre-patent period, Probationary period, Project period, Refractory period, REMS period, Sleep stage period, Sleep-onset REMS period, Total sleep period, Waiting period, Window period.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. A certain duration or division of time.
2. One of the stages of a disease, e.g., period of incubation, period of convalescence.
See also: stage, phase
3. Colloquialism for menses.
4. Any of the horizontal rows of chemical elements in the periodic table.
[G. periodos, a way round, a cycle, fr. peri, around, + hodos, way]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


1. A certain duration or division of time.
2. One of the stages of a disease.
[G. periodos, a way round, a cycle, fr. peri, around, + hodos, way]
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about period

Q. i just have my period last november 25 and ended on 28.when is my possible fertile and ovulation period please help me identify my fertile and ovulation period

A. If someone knew it, it'd solve the human race many problems with fertility. The problem is that ovulation (and thus, the period of possible fertility) happens 14 days BEFORE the onset of menses, so you know about it only retrospectively.

However there ways such as serial body temperature measuring, along with kits that measures the level of hormones in the urine in order to estimate the time of the coming ovulation, and help in timing intercourse.

You may read more about it here ( ) but anyway, consulting a doctor (e.g. gynecologist) may be wise.

Q. can you get pregnant on your period? i know that you get pregnant when you ovulate and you ovulate in the middle of your menstration cycle, but people have told me that you can get pregnant on your period. can somebody help me out???

A. It's possible, if your menses are long enough and your period is short enough, since semen can survive (and fertilize the ova) up to 3 days after intercourse. It's not common, but also not impossible. That's why the safe-days method isn't very effective in preventing pregnancy.

Q. how should i support my wife during this tough period?

A. first of all don't call it a tough period. a happy period might work better. although the wife can get annoyed by it. but she'll get annoyed from anything... just try to make her comfortable. foot massage , bubble baths, movies and popcorn.
it really depends on what kind of person is she and what she likes or not.


More discussions about period
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References in periodicals archive ?
Girls also believed that a monthly period is necessary to cleanse the body and that stopping this cycle could have harmful effects.
In Malawi, 30 per cent of girls had been scared when they first started their monthly period while 48 per cent of girls in Iran, 10 per cent in India and seven per cent in Afghanistan believe menstruation is a disease.
Accordingly, for the monthly period from 15 June to 14 July, all shareholders of record on 1 July will receive the dividend payment on 16 July 2018; for the monthly period from 15 July to 14 August, the dividend will be paid on 15 August to all shareholders of record date on 1 August; and for the period from 15 August to 14 September, the dividend to shareholders of record date on 1 September will receive the dividend payment on 17 September 2018.
According to the Daily Express, one of the pivotal signs can be bleeding from the vagina at any time, other than during monthly period.
Introducing: “Mr Dudley's Cycle Relief Cream with Nutmeg!” Utilizing the power of nutmeg oil and the triple-action-formula that Mr Dudley's Topical Pain Cream has become known for, Cycle Relief works quickly to relieve cramps caused by the monthly period.
In addition, trade license applications were up 9 per cent in July 2012 compared to the same monthly period in 2011, according to the Department of Economic Development, giving a strong indication of improved business confidence in the Emirate.
This happens when instead of leaving the body as normal in the form of a monthly period, the discarded womb lining flows backwards instead, reaching the abdomen through the fallopian tubes.
SCOTLAND's property market continues to show a seemingly short-term blip with the overall volume of sales down in the latest monthly period.
Peter Duggan, Strategic Information Services, at the Irish Food Board, Bord Bia, told Feedinfo News Service that latest figures indicated that household beef expenditure in Britain for the latest monthly period ending the 21st of March has picked up.
PMS is the name given to the collection of symptoms many women suffer leading up to their monthly period. Often the butt of many jokes, PMS is no laughing matter.
The new guidelines ensure the average working week will be limited to 48 hours, over a monthly period.
More than 250,000 women in Ireland suffer from migraines during their monthly period.

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