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M

Malignant
The term that describes a tumour that invades and destroys the tissue in which it originates and which is capable of spreading locally or metastasising.
Mammary gland
A gland that secretes milk.
Mammography
A radiographic means of examining the tissues of the breast.
Mastectomy
Removal of the whole breast.
Melanin
Pigment in the skin, the amount of which determines the darkness of the skin.
Melanoma
A form of skin cancer that affects the pigment producing cell in the skin and is capable of spreading rapidly through the body.
Membrane
1. A thin, pliable layer of tissue covering surfaces or separating or connecting regions, structures, or organs of an animal or a plant. 2. Cell membrane.
Menarche
The time at which menstruation first begins.
Menopause
The cessation of production of an egg by the ovaries. The menopause happens naturally in women aged 45-55 years and can be induced prematurely by surgical removal of the ovaries.
Menstrual cycle
The periodic, 4-weekly sequence of events in sexually mature women which prepares the body for reproduction by producing an egg and growing the endometrial lining of the uterus for implantation.
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