abdominal injury Quick reference
Physical damage to the abdomen and its contents. The abdomen is particularly vulnerable to blows during contact and collision sports.
abduction Quick reference
Movement of a body segment (e.g. arm or leg) away from the midline of the body. The term also refers
aberration of starlight Quick reference
The small apparent difference between the observed direction of a star and its true direction (see diagram). It is due to the combined effect of the observer’s motion across the path of incoming starlight and the finite velocity of light. The actual amount of displacement and its direction depend on the observer’s speed and direction of motion. Aberration of starlight resulting from the Earth’s orbital motion is termed ...
absolute value Quick reference
For any real number the absolute value (also called the *modulus) of denoted by is itself if and
accretionary wedge Quick reference
A tectonically thickened wedge of *sediment found on the landward side of some *trenches. The accretionary wedge consists of oceanic sediment scraped off the subducting ...