Age by decade: A term designating someone’s age by decade. For example, a septuagenarian refers to someone in his or her seventies (age 70 to 79). The prefix in such terms is always from the Latin. For example, the Latin septuageni = seventy.
Denarian: Someone age 10 to 19.
Vicenarian: Someone in his or her twenties.
Tricenarian: Someone in his or her thirties.
Quadragenarian: Someone in his or her forties.
Quinquagenarian: Someone in his or her fifties.
Sexagenarian: Someone in his or her sixties.
Septuagenarian: Someone in his or her seventies.
Octogenarian: Someone in his or her eighties.
Nonagenarian: Someone in his or her nineties.
Centenarian: Someone 100 or more.
Supercentenarian: Someone 110 years old or more (no upper limit).
The terms denarian, vicenarian, tricenarian, and quadragenarian are not in common usage. The term supercentenarian was coined in 1991.
- Age-related macular degeneration
Age-related macular degeneration: An eye disease with its onset usually after age 60 that can progressively destroy the macula, the central portion of the retina, impairing central vision. Age-related macular degeneration (AMD or ARMD) rarely causes blindness because only the center of vision is affected. However, injury to the macula in the center of the […]
Agenesis: Lack of development. For example, agenesis of a toe means the toe failed to form.
- Agency for Toxic Substances and Disease Registry
Agency for Toxic Substances and Disease Registry: An agency of the U.S. Department of Health and Human Services under the Public Health Service that works with states and other federal agencies to prevent exposure to hazardous substances from waste sites. The agency conducts public health assessments, health studies, surveillance activities, and health education training in […]
- Agenesis of the corpus callosum
Agenesis of the corpus callosum: A congenital abnormality (a birth defect) in which there is partial or complete absence (agenesis) of the corpus callosum, the area of the brain which connects the two cerebral hemispheres (the two halves of the brain). Agenesis of the corpus callosum can occur as a severe syndrome in infancy or […]
- Agenesis of the gallbladder
Agenesis of the gallbladder: A condition in which the gallbladder fails to develop. It occurs in 1 in about every 1,000 people, usually without additional birth defects.