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The Collaborative International Dictionary
Menstruation

Menstruation \Men`stru*a"tion\, n. The discharge of the menses; also, the state or the period of menstruating.

Douglas Harper's Etymology Dictionary
menstruation

1680s, from Late Latin menstruare, from menstruus "monthly" (see menstrual) + -ation. Old English equivalent was monaðblot "month-blood." Middle English had menstrue (n.), late 14c., from Old French menstrue, from Latin menstruum.

Wiktionary
menstruation

n. The periodic discharging of the menses, the flow of blood and cells from the lining of the uterus in females of humans and other primates.

WordNet
menstruation

n. the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause; "the women were sickly and subject to excessive menstruation"; "a woman does not take the gout unless her menses be stopped"--Hippocrates; "the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"--Aristotle [syn: menses, menstruum, catamenia, period, flow]

Wikipedia
Menstruation

Menstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. Up to 80% of women report having some symptoms prior to menstruation. Common signs and symptoms include acne, tender breasts, bloating, feeling tired, irritability, and mood changes. These may interfere with normal life, therefore qualifying as premenstrual syndrome, in 20 to 30% of women. In 3 to 8%, symptoms are severe.

The first period usually begins between twelve and fifteen years of age, a point in time known as menarche. However, periods may occasionally start as young as eight years old and still be considered normal. The average age of the first period is generally later in the developing world, and earlier in the developed world. The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 31 days in adults (an average of 28 days). Menstruation stops occurring after menopause, which usually occurs between 45 and 55 years of age. Bleeding usually lasts around 2 to 7 days.

The menstrual cycle occurs due to the rise and fall of hormones. This cycle results in the thickening of the lining of the uterus, and the growth of an egg, (which is required for pregnancy). The egg is released from an ovary around day fourteen in the cycle; the thickened lining of the uterus provides nutrients to an embryo after implantation. If pregnancy does not occur, the lining is released in what is known as menstruation.

A number of problems with menstruation may occur. A lack of periods, known as amenorrhea, is when periods do not occur by age 15 or have not occurred in 90 days. Periods also stop during pregnancy and typically do not resume during the initial months of breastfeeding. Other problems include painful periods and abnormal bleeding such as bleeding between periods or heavy bleeding. Menstruation in other animals occurs in primates, such as apes and monkeys, as well as bats and the elephant shrew.

Menstruation (mammal)

Menstruation in mammals is the shedding of the uterine lining ( endometrium). It occurs on a regular basis in sexually reproductive-age females of certain mammal species.

Though there is some disagreement in definitions between sources, menstruation is generally considered to be limited to primates. Overt menstruation (where there is bleeding from the uterus through the vagina) is found primarily in humans and close relatives such as chimpanzees. It is common in simians ( Old World monkeys, New World monkeys, and apes), but completely lacking in strepsirrhine primates and possibly weakly present in tarsiers. Beyond primates, it is known only in bats and the elephant shrew.

Females of other species of placental mammal undergo estrous cycles, in which the endometrium is completely reabsorbed by the animal (covert menstruation) at the end of its reproductive cycle. Many zoologists regard this as different from a "true" menstrual cycle. Female domestic animals used for breeding —for example dogs, pigs, cattle, or horses— are monitored for physical signs of an estrous cycle period, which indicates that the animal is ready for insemination.

Usage examples of "menstruation".

Liebreich found examples of retinal hemorrhage in suppressed menstruation, and Sir James Paget says that he has seen a young girl at Moorfields who had a small effusion of blood into the anterior chamber of the eye at the menstrual period, which became absorbed during the intervals of menstruation.

The constipated condition of the bowels, often leads to congestion of the uterus and leucorrhea, followed by uterine debility, prolapsus, excessive menstruation, anteversion or retroversion of that organ.

Menstruation, or the menses, monthly visitation, catamenia, menstrual flow, courses, or periods, usually makes its appearance in the female between the twelfth and fifteenth years, at which time the reproductive system undergoes remarkable changes.

In a London discussion there was mentioned the case of a healthy woman of fifty who never was pregnant, and whose menstruation had ceased two years previously, but who for twelve months had menstruated regularly from the nipples, the hemorrhage being so profuse as to require constant change of napkins.

Emmet cites an instance of menstruation at seventy, and Brierre de Boismont one of a woman who menstruated regularly from her twenty-fourth year to the time of her death at ninety-two.

There is recorded an inexplicable case of menstruation from the region of the sternum, and among the curious anomalies of menstruation must be mentioned that reported by Parvin seen in a woman, who, at the menstrual epoch, suffered hemoptysis and oozing of blood from the lips and tongue.

Cases of semimonthly menstruation and many similar anomalies of periodicity are spoken of.

Mackenzie cites the instance of a woman aged thirty-two, a primipara, who had been married ten years and who always had been regular in menstruation.

It also aids nutrition, and thus tones up the general system, so that in the form of profuse menstruation, resulting from debility, the patient is strengthened, her blood enriched, and her nervousness quieted, which constitutes the necessary treatment to make the cure permanent.

Among others, deranged menstruation, prolonged nursing of children, pregnancy, abortions, excessive indulgence in sexual intercourse, uncleanliness, piles, uterine ulcers, and displacement of the womb, are the most common.

There is recorded an inexplicable case of menstruation from the region of the sternum, and among the curious anomalies of menstruation must be mentioned that reported by Parvin seen in a woman, who, at the menstrual epoch, suffered hemoptysis and oozing of blood from the lips and tongue.

The antigay passage rubs shoulders with passages condemning masturbation, or sex during menstruation.

The coexistence of a floating kidney in this case may have been responsible for this hemorrhage, and in reading reports of so-called menstruation due consideration must be given to the existence of any other than menstrual derangement before we can accept the cases as true vicarious hemorrhage.

Storer, Clay, Tait, and the British and Foreign Medico-Chirurgical Review report cases in which menstruation took place with neither uterus nor ovary.

Menstruation after hysterectomy and ovariotomy has been attributed to the incomplete removal of the organs in question, yet upon postmortem examination of some cases no vestige of the functional organs in question has been found.