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M

    
      magnetic therapy: physical therapy technique using magnetic fields to
      create a low energy electrical field. It causes dilation of the blood
      vessels (vasodilation) and tissue stimulation. Magnetic therapy may be
      used on soft tissue to treat such injuries as tendonitis or bony
      (skeletal) injuries such as bucked shins.
     
      maiden: 1) a horse or rider that has not won a race. 2) a female horse
      that has never been bred.
     
      malignant: referring to a cancerous growth: locally invasive and
      destructive, and/or tending to spread to other areas of the body.
     
      mare: female horse five years old or older. In American Quarter horses,
      four and older.
     
      martingale: piece of tack used to help the rider maintain control in
      horses that evade the action of the bit by raising their head.
     
      mash: soft, moist mixture, hot or cold, of bran, grain and other feed that
      is easily digested by horses.
     
      massage: rubbing of various parts of the anatomy to stimulate healing or
      relaxation.
     
      medial: pertaining to the middle in anatomy, nearer the media plane (the
      vertical plane that bisects the center) of the body when viewed from in
      front or behind.
     
      melanoma: usually firm, smooth, hairless black nodules relatively common
      in gray horses, most often found u der a horse's tail, around his ear and
      on his face near the main joint of his jaw. Some can grow aggressively,
      causing erosions and spreading to adjacent lymph nodes and lungs. Most
      melanomas grow slowly and are benign (don't tend to spread to other
      organs). Treatment is seldom recommended, as external melanomas often
      return after surgical removal. 
     
      metacarpal: usually refers to a fracture of the cannon bone, located
      between the knee and the fetlock joint in the front leg. Also, may refer
      to a fracture of the splint bone.
     
      mid-body (fracture): see sesamoids.
     
      midges, no-see-ums: tiny flies of the Culicoides family, considered
      responsible for the warm-weather skin allergy called Sweet itch.
     
      monorchid: a male horse of any age that has only one testicle in his
      scrotum; the other testicle was either removed or is undescended. See
      cryptorchid; ridgling.
     
      moon blindness: a disease of the uvea (the colored iris) inside the
      eyeball. The uvea becomes inflamed (uveitis), which causes its muscles to
      spasm, thereby constricting the pupil. Eye pain from uveitis is severe and
      can cause squinting, tearing, excessive blinking and dangerous eye rubbing
      (increasing the risk of eye trauma). If not resolved, uveitis can result
      in permanent blindness. Treatment can include topical and systemic
      medication to relieve pain and inflammation, relax the spasming and combat
      possible infection. 
     
     musculoskeletal system: consisting of the bones, muscles, ligaments, 
     tendons and joints of the head, vertebral column and limbs, together with 
     the associated muscles, tendons, ligaments and joints.
    
     muzzle: 1) nose and lips of a horse. 2) a guard placed over a horse’s 
     mouth to prevent it from biting or eating.