Dictionary of Medical Terms

Gain a better understanding of medical terminology by searching our dictionary of more than 1,300 terms.

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  • cocaine

    A drug that is made from coca leaves. It can be used by a doctor as a topical anesthetic. It’s…

  • coccyx

    The tailbone.

  • cochlea

    The portion of the inner ear that senses sound.

  • coitus

    Sexual intercourse.

  • cold

    An upper respiratory infection.

  • cold sore

    Herpes simplex infection of the lip.

  • colic

    1. A sudden, spasmodic abdominal pain. 2. In infants, a pattern of excessive crying, apparent abdominal pain and irritability.

  • collagen

    A protein formed in the connective tissue of the body.

  • colon

    The large intestine.

  • Colorado tick fever

    A viral illness spread by ticks. Characterized by headache, backache and fever that begins to break and then returns midway…

  • colostomy

    Surgery that makes an opening to the intestine through the surface of the abdomen. The opening empties the bowels.

  • colostrum

    An antibody-rich fluid released by the breasts for a short time after the birth of a baby, before the true…

  • comedo

    A dark-topped plug of fatty material in the opening of a hair follicle. The color is the result of exposure…

  • communicable disease

    A disease spread through direct contact with an infected person or substance.

  • compress

    A dressing used to apply pressure or medicine to an area. Useful in applying heat or cold.

  • compulsion

    An overwhelming urge to perform an act. Often used to describe ritual or repetitive behaviors.

  • conception

    Fertilization. The union of sperm and egg.

  • concussion

    A loss of consciousness because of a head injury.

  • condom

    A sheath worn over the penis or inside the vagina (female condom) during intercourse to protect against pregnancy and…

  • Cone

    The light-sensing structure on the retina of the eye capable of detecting color.

  • congenital

    Present at birth.