Rash facts. 1  Rash is not a specific diagnosis. Instead it refers to any sort of skin inflammation and/or discoloration that distorts the skin's normal appearance. 2  Common rashes include eczema, poison ivy, hives, and athlete's foot. 3  Infections that cause rashes may be fungal, bacterial, parasitic, or viral.
Many of us use the term Styrofoam as a reference to most plastic foam packaging. We include foam drinking cups, packaging peanuts and the white material that our appliances, toys and so many other items are packaged in. In fact, most of this is not Styrofoam.
4. a term, idea, etc, that is based on or derived from another in the same class. 5. (Linguistics) a word derived from another word. 6. (Chemistry) chem a compound that is formed from, or can be regarded as formed from, a structurally related compound: chloroform is a derivative of methane.