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Ionic Compound Definition Ionic compound is a compound formed by ions bonding together through electrostatic forces. Ionic compounds are also known as electrically neutral compounds:…

Sella Turcica Definition Sella Turcica is a bony cavity housing the pituitary gland, which is located in the brain and responsible for secreting a number…

Sunspot Definition Sunspots are easily recognized as speckles on the surface of the sun. Sunspots appear dark because they are cooler, by up to 1,500°K,…

Sodium Hydroxide Definition Sodium hydroxide is toxic and strongly alkaline and is used to make chemicals and soaps and to refine petroleum. It is a…

Sphenoid Bone Definition Sphenoid bone is the large butterfly-shaped compound bone at the base of the skull, which containing a protective depression for the pituitary…

About Photosphere Definition Photosphere is the lowest visible layer of a star, lying beneath the chromosphere and the corona. The term itself is derived from…

Pituitary Gland Definition Pituitary gland is a pea-sized gland located in the center of the skull, inferior to the hypothalamus of the brain and posterior…

Hydroxide Definition Hydroxide is a chemical compound containing one or more hydroxyl radicals (OH). The positively charged portion of the compound usually is the ion…

Chromosphere Definition Chromosphere is a glowing, transparent layer of gas surrounding the photosphere of a star. The Sun’s chromosphere is several thousand kilometers thick, is…

Neuroanatomy Definition Neuroanatomy is the branch of anatomy that deals with the nervous system. It is the neural structure of an organ or a part.…

About Nervous System Definition The nervous system of vertebrates is a complex information-processing system that consists mainly of the brain, spinal cord, and peripheral and…

Polyatomic Ion Definition Polyatomic ion is an ion comprised of two or more atoms. It also known as a molecular ion, which is a charged…