Web site:
http://www.phschool.com/science/biology_place/glossary/index.html
This collection of over 1000 biological terms and definitions is available for quick reference
as you use The Biology Place, Classic Edition.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A
Abaxial
The term abaxial (or dorsal) describes a plant part, side or surface facing away from the the
axis of any organ or part; eccentric.
Abdomen
In vertebrates, the portion of the trunk containing visceral organs other than heart and
lungs; in arthropods, the posterior portion of the body, made up of similar segments and
containing the reproductive organs and part of the digestive tract.
Abiotic
Nonliving; specifically, the nonliving components of an ecosystem, such as temperature,
humidity, the mineral content of the soil, etc.
Aboral
Upsied down, : the aboral surface of a starfish.Pertaining to away from the mouth in
organisms with no distinct front or back sides
Abscisic acid
A plant hormone that generally acts to inhibit growth, promote dormancy, and help the
plant tolerate stressful conditions.
Abscission
In plants, the dropping of leaves, flowers, fruits, or stems at the end of a growing season, as
the result of formation of a two-layered zone of specialized cells (the abscission zone) and
the action of a hormone.
Absorption
The movement of water and dissolved substances into a cell, tissue, or organism.