Urticariaâthe scientific name for hivesâis an outbreak of red, swollen, and itchy welts that form on the skin. Hives appear suddenly and can appear anywhere on the body, including the face, lips and throat. They typically vary in size, and may join together to form larger welts.
Define effectivity. effectivity synonyms, effectivity pronunciation, effectivity translation, English dictionary definition of effectivity. adj. 1. a. Having an intended or expected effect. b. Producing a strong impression or response; striking: gave an effective performance as Othello.
Effect is defined as a result of something or the ability to bring about a result. 1  An example of effect is slurred speech after having a few cocktails. 2  An example of effect is weight loss from a consistent exercise routine.  anything brought about by a cause or agent; result.