Category: M

  • Multiparous

    Multiple pregnancies. A woman who has had more than one pregnancy. The designation for a woman who has undergone two or more pregnancies that culminated in childbirth, regardless of whether the fetuses were alive during the birthing process.  

  • Metatarsophalangeal

    Pertaining to the metatarsus and phalanges of the toes. Related to the metatarsus and the phalanges (toe bones).  

  • Metaplastic

    Characterized by metaplasia (a reversible change of cells usually caused by stress or injury); cancer formation can occur with chronic inducing stimulus by injury or irritation.  

  • Metabolic acidosis

    Excessive acid in the body fluids caused by dehydration, diarrhea, vomiting, renal disease, or hepatic impairment. Acidosis caused by a malfunction of the body’s metabolism. Acid-base imbalance associated with shock, diabetes, starvation, alcoholism, renal failure, or severe diarrhea and characterized by shortness of breath, lethargy, confusion, drowsiness, flushed and warm skin, hypotension, stupor, and coma.…

  • Meibomian gland

    A sebaceous gland on the posterior margin of each eyelid. A sebaceous gland on the edge of the eyelid which secretes a liquid to lubricate the eyelid. Sebaceous glands located in the tarsi of the eyelids, whose ducts empty into the lid margins. Sebaceous glands at the edges of the eyelids that secrete sebum from…

  • Megaloblastic

    Pertaining to abnormally large red blood cells found in pernicious anemia.  

  • Mediastinum

    The area in the chest between the lungs. A cavity between two major portions of an organ, especially in reference to the area of the thoracic cavity containing all of the structures except the lungs. The section of the chest between the lungs, where the heart, oesophagus and phrenic and vagus nerves are situated. Space…

  • Mediastinal shift

    Abnormal movement of the structures within the mediastinum to one side of the chest cavity.  

  • Myringotomy

    Surgical incision of the tympanic membrane (eardrum). A surgical incision of the eardrum performed to release fluid or pus from the middle ear. An incision of the eardrum to establish drainage in infection of the middle ear. A surgical operation to make an opening in the eardrum to allow fluid to escape. Surgical incision into…

  • Myelosuppression

    Concerning inhibition of bone marrow function. A condition in which the bone marrow does not produce enough blood cells, often occurring after chemotherapy. Decreased production of blood cells by the bone marrow. A fall in the production of blood cells in the bone marrow. This fall often occurs after chemotherapy for cancer. Anaemia, infection and…