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Retina Definition Retina is the light-sensitive membrane that lines the inside of the back of the eyeball and connects to the brain by the optic…

Malachite Definition Malachite is a bright-green monoclinic mineral occurring as a mass of crystals (an aggregate) with smooth or botryoidal (grape-shaped) surfaces. It is often…

About Cornea Definition Cornea is the clear, dome­shaped surface that covers the front of the eye and it is the eye’s outermost layer. It lies…

Copper(II) Carbonate Definition Copper(II) carbonate is a compound, CuCO3, that was used as a sulfide scavenger for water-base muds. It was found to be corrosive…

Sodium Nitrate Definition Sodium nitrate is a poisonous, white, crystalline compound used in solid rocket propellants, in matches, as a fertilizer, and in curing meat.…

Potassium Nitrate Definition Potassium nitrate (KNO3) is a transparent, white, crystalline compound and strong oxidizing agent. It is used in gunpowder and fireworks, in making…

Calculating the Area of a Parallelogram The area of a parallelogram can be found by multiplying the base times the height. It means the number…

About Azurite Definition Azurite is a soft stone, named for its deep “azure blue” color. It is a copper carbonate mineral found in the upper…

Lens (Anatomy) Definition Lens is a transparent structure behind the iris of the eye that focuses light entering the eye on the retina. The lens…

Potash Definition Potash is any of several chemical compounds that contain potassium, especially potassium carbonate (K2CO3), which is a strongly alkaline material obtained from wood…

Copper Sulfide Definition Copper sulfide is a crystalline solid used as a semiconductor and in photo optic applications. It is the black, bluish black, or…

Blood Vessel Definition Blood vessel is an elastic tube or passage in the body through which blood circulates; an artery, a vein, or a capillary.…