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Accessory Structure in biology, a structure that assists or can take over the function of another (the primary) structure.

Accessory 1. adj. ancillary, supplemental, or contributory. 2. n. a thing or person that is supplementary or subordinate.

Acceptance Sampling a process in which a random sample is chosen from a larger group of items and used to make a…

Acceptance and Commitment Therapy (ACT) a form of cognitive behavior therapy based on the premise that ineffective verbal strategies to control one’s thoughts and…

Accentuation Theory the proposition that classification of items produces encoding biases, that is, that individuals tend to exaggerate (accentuate) the similarities among…

Acceleration – deceleration injury a form of head injury caused by the head suddenly being placed into motion or abruptly stopped, as, for example,…

Acceleration Effects physiological, biochemical, or psychological changes in the body resulting from acceleration imposing g-forces greater than 1. Examples include displacement of…

Acatamathesia (Akatamathesia) n. loss of the ability to comprehend sensory stimuli in general or speech in particular.

Acamprosate n. an analog of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA) used in the management of alcohol dependence. Although exact mechanisms of action are unclear,…

Acalculia n. loss of the ability to perform simple arithmetic operations that results from brain injury or disease, usually to the parietal lobe. It…