Glossary A

Achromatic color refers to color without hue. White, black, and all the grays between these two (2) extremes are Achromatic colors.

Achromatopsia refers to the inability to discriminate among different hues; caused by damage to the visual association cortex.

Acidophilic adenoma refers to a functioning type of pituitary gland tumor that usually appears in the anterior lobe of the pituitary gland. The Acidophilic adenoma creates excessive secretion of growth hormones often resulting in Gigantism and Acromegaly . Acidophilic adenoma, likewise refers to a a tumor of the pituitary gland characterized by cells that can be stained red with an acid dye. Gigantism and Acromegaly can result from the hypersecretion of growth hormone caused by an Acidophilic adenoma.

Acidosis is an abnormal increase in blood hydrogen ion concentration, that is, arterial pH below 7.35).

Acids are compounds capable of giving up hydrogen ions into solution.

Acoustic demarcation when an animal makes sounds to signal its presence examples include singing of birds, calling of amphibians, hooting of some primates, howling of wolves and coyotes.

Acoustic neuroma refers to the progressively enlarging, benign tumor within the auditory canal arising from Schwann cells of the VIIIth cranial nerve .

Acoustic phonetics refers to the branch of phonetics that specifies the acoustic characteristics associated with each speech sound.

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