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Reast is not a standard English term with a defined meaning. In most writing, it appears as a misspelling or typographical error for "breast." It may also be encountered as a surname or in very rare place names, but there is no widely recognized meaning attached to the term itself.

If the intended term is "breast," it refers to the anterior chest region that contains the mammary glands. In humans, the breast is composed of glandular tissue, fat, ducts, and connective tissue, with the nipple at its center. Its primary biological function is lactation, producing milk for offspring, under hormonal control during puberty and pregnancy. Breasts vary in size and shape among individuals and can change with age, hormonal status, and health.

In medical contexts, breasts are routinely examined for signs of disease. Breast cancer is among the most common cancers worldwide; early detection through self-exam, clinical exams, and imaging such as mammography can improve outcomes. Other conditions include benign cysts, fibroadenomas, and infections. Etymology: The word "breast" comes from Old English brēost. The form "reast" is a nonstandard variant. If you meant a specific place or surname, more context is needed to identify it.