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Complementary Angles Two angles are complementary if the sum of their angles equals 900. A common case is when they form a right angle. If…

Gland Definition Gland is an organ or group of specialized cells in the body that produces and secretes a specific substance, such as a hormone.…

Sodium Nitrite Definition Sodium nitrite is a white crystalline compound used to lower systemic blood pressure, to relieve local vasomotor spasms, to relax bronchial and…

Caesium Definition Caesium is a soft, ductile, silvery-white element of the alkali group. It is liquid at room temperature and is the most reactive of…

Nitrous Oxide Definition Nitrous oxide is a colorless, sweet-smelling gas. It is used as a mild anesthetic, often called laughing gas. Nitrous oxide occurs naturally…

Epithelium Definition Epithelium is the thin, membranous tissue that lines most of the internal and external surfaces of an animal’s body. It is composed of…

Definition Barium is a soft, silvery-white metallic element of the alkaline-earth group. It occurs only in combination with other elements, especially in barite. It is…

Adipose Tissue Definition Adipose tissue is a connective tissue consisting chiefly of fat cells surrounded by reticular fibers and arranged in lobular groups or along…

Strontium Definition Strontium is a soft, silvery metallic element of the alkaline-earth group that occurs naturally only as a sulfate or carbonate. It is the…

Rubidium Definition Rubidium is a soft, silvery-white metallic element of the alkali group. It ignites spontaneously in air and reacts violently with water. It is…

Reticular Connective Tissue Definition Reticular connective tissue is a type of tissue found in the body that is supported with a branching framework of collagen…

About Lithium Definition Lithium is a soft, silvery metallic element of the alkali group that occurs in small amounts in some minerals. It is the…