Ad-


Ad-: Prefix indicating toward or in the direction of. For example, adduction is the movement of a limb toward the midline of the body, and adrenal literally means ‘toward the kidney.’

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  • Ad lib

    Ad lib: Abbreviation for the Latin “ad libitum” meaning “at pleasure” and “at one’s pleasure, as much as one desires, to the full extent of one’s wishes.” Sometimes seen on a prescription or doctor’s order. For example, during an overnight fast when the patient is not to eat any food but can have water, the […]

  • Aerobic exercise

    Brisk exercise that promotes the circulation of oxygen through the blood and is associated with an increased rate of breathing. Examples include running, swimming, and bicycling.

  • Aeromonas hydrophila

    Aeromonas hydrophila: a type of bacteria commonly found in freshwater or brackish water and in some fish and shellfish. It may cause stomach upset, diarrhea, and vomiting in some individuals if swallowed. It is more likely to cause intestinal symptoms in people with a suppressed immune system, such as people with cancer or those who […]

  • Aerophagia

    Aerophagia: Swallowing too much air, a common cause of gas in the stomach and belching. Everyone swallows small amounts of air when eating or drinking. However, rapid eating or drinking, chewing gum, smoking, or ill-fitting dentures may cause a significant increase in swallowed air. The word “phage” in Greek means “to eat.” Aerophagia is literally […]

  • Aerophobia

    Aerophobia: An abnormal and persistent fear of flying. Sufferers experience severe anxiety even though they usually realize that the flying does not pose a threat commensurate with their fear. Aerophobia also means an irrational fear of fresh air or drafts of air. Derived from the Greek “aero-“, air or gas + “phobos”, fear = literally, […]


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