Science

Tanzanite Definition Tanzanite is the violet to blue form of the mineral zoisite.  It is a calcium alumina hydroxy silicate. The gemstone was discovered by…

Reciprocal or Multiplicative Inverse When the product of two numbers is one, they are called reciprocals or multiplicative inverses of each other. For example, 2/7…

Adrenal Gland Definition Adrenal gland is a small gland located on top of the kidney. The outer portion, or cortex, secretes steroid hormones (corticosteroids). The…

Zoisite Definition Zoisite is a grayish or whitish mineral occurring in orthorhombic, prismatic crystals, also in columnar masses. It is a silicate of alumina and…

Corticosteroid Definition Corticosteroid is any of the steroid hormones, such as cortisol or aldosterone, produced by the cortex of the adrenal gland. Corticosteroids are also…

About Potassium Definition Potassium is a soft, highly reactive, silvery-white metallic element of the alkali group occurring in nature only in compounds. It is essential…

About Rosacea Definition Rosacea is a chronic dermatitis of the face, especially of the nose and cheeks, characterized by a red or rosy coloration with…

Epidote Definition Epidote is a yellowish-green or blackish-green monoclinic mineral. Epidote occurs as formless grains or as prism-shaped crystals, and is found in limestones that…

Additive inverse of a Number The Additive Inverse Axiom states that every real number has a unique additive inverse. Zero is its own additive inverse.…

Potassium Hydroxide Defnition Potassium hydroxide is a noncombustible, hydrophilic substance and therefore is highly corrosive to metal and tissue. It readily absorbs moisture from the…

Lawsonite Definition Lawsonite is an uncommon mineral that occurs at high pressures and low temperatures in regionally metamorphosed, low-grade, glaucophane-bearing schists. It can also form…

Hot Flash Definition Hot flash is a feeling of warmth, sometimes associated with flushing that spreads over the body and sometimes followed by perspiration. It…