Adventitia: The outermost connective tissue covering of any organ, vessel, or other structure. For example, the connective tissue that surrounds an artery is called the adventitia because it is considered extraneous to the artery.
“Adventitia” comes from the Latin “adventicius” meaning “foreign, strange, extraneous, coming from abroad or from outside.” Other English words that stem from “advenire” include “adventure” and “avenue.”
A related term is “adventititious” meaning “coming from an external source or occurring in an unusual place or manner.” When a doctor or nurse listens to the chest or abdomen, adventitious sounds are those that are normally not heard coming from the chest or abdomen.
Adventitious: Coming from an external source or occurring in an unusual place or manner. Not inherent, inherited or innate but rather occurring accidentally or spontaneously. When a doctor or nurse auscults (listens to) the chest or abdomen, adventitious sounds are those that are normally not heard coming from the chest or abdomen. The word “adventitious” […]
- Adverse effect
Adverse effect: A harmful or abnormal result. An adverse effect may be caused by administration of a medication or by exposure to a chemical and be indicated by an untoward result such as by illness or death.
- Adverse event
Adverse event: In pharmacology, any unexpected or dangerous reaction to a drug or vaccine.
- Adverse reaction
Adverse reaction: In pharmacology, any unexpected or dangerous reaction to a drug. An unwanted effect caused by the administration of a drug. The onset of the adverse reaction may be sudden or develop over time. Also called an adverse drug event (ADE), adverse drug reaction (ADR), adverse effect or adverse event.
- ADA (American Dental Association)
ADA (American Dental Association): The mission statement of the ADA reads as follows: “The ADA is the professional association of dentists dedicated to serving both the public and the profession of dentistry. The ADA promotes the public’s health through commitment of member dentists to provide quality oral health care, accessible to everyone. The ADA promotes […]