Latex, as found in nature, is the milky sap of many plants that coagulates on exposure to air. It is a complex emulsion in which proteins, alkaloids, starches, sugars, oils, tannins, resins and gums are found. In most plants latex is white, but some have yellow, orange, or scarlet latex.
The word also refers to the thin stretchy material obtained by processing the sap (see Latex clothing, below). It can also be made synthetically by polymerizing a monomer that has been emulsified with surfactants.
http://en.wikipedia.org/wiki/Latex
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