Category: Am-Am

  • Amygdaloid

    Like an almond. Almond-shaped. As the amygdaloid nucleus in the brain, a structure that anatomists thought resembled an almond. Amygdaloid is pronounced in three syllables: amyg da loid. From the Greek amydale (almond) + the Greek eidos (like).

  • Amygdala

    The amygdaloid nucleus in the brain. The tonsils. These structures were so named because they appeared to be shaped like an almond. From the Greek amydale (almond) + the Greek eidos (like).

  • Amusia

    The inability to recognize musical tones or to reproduce them. Amusia can be congenital (present at birth) or be acquired sometime later in life (as from brain damage). Amusia is composed of a- + -musia and literally means the lack of music. Also commonly called tone deafness.

  • Amuck

    A syndrome first reported in the Malay people, usually male, consisting of a period of brooding followed by a sudden outburst of indiscriminate murderous frenzy, sometimes provoked by an insult, jealousy or sense of desperation. The person who runs amok may also die in a form of murder-suicide. Spelled also amuck. The Malay word for…

  • Amsler grid

    While conducting an eye examination, the eye care professional may ask the patient to look at an Amsler grid. This grid is a pattern that resembles a checkerboard. The patient covers one eye and stares at a black dot in the center of the grid. While staring at the dot, the patient may notice that the straight…

  • AMS (atypical measles syndrome)

    An altered expression of measles, AMS begins suddenly with high fever, headache, cough, and abdominal pain. The rash may appear 1 to 2 days later, often beginning on the limbs. Swelling (edema) of the hands and feet may occur. Pneumonia is common and may persist for 3 months or more. AMS occurs in persons who were incompletely immunized against measle. This may happen if a person…

  • AMS (acute mountain sickness)

    Acute mountain sickness (AMS) is the effect on the body of being in a high altitude environment. AMS is common at high altitudes, that is above 8,000 feet (2,440 meters). Three-quarters of people have mild symptoms of AMS over 10,000 feet (3,048 meters). The occurrence of AMS depends on the altitude, the rate of ascent, and individual…

  • Amputation

    Removal of part or all of a body part that is enclosed by skin. Amputation can occur at an accident site, the scene of an animal attack, or a battlefield. Amputation is also performed as a surgical procedure. It is typically performed to prevent the spread of gangrene as a complication of frostbite, injury, diabetes, arteriosclerosis, or any other illness…

  • Ampullary carcinoma

    Cancer of a structure called the ampulla of Vater, a small muscle located at the junction where the common bile duct (carrying bile from the liver and secretions from the pancreas) empties into the duodenum (upper small intestine). Because of its location, this cancer can cause obstruction of the common bile duct and prevent bile from flowing into the intestine…

  • Ampulla of Vater

    A small projection into the duodenum through which bile and pancreatic secretions flow to mix with food for digestion.