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.
Selectivity in analytical chemistry. (IUPAC Recommendations 2001) Abstract: The correct use of the term âselectivityâ and its clear distinction from the. term âspecificityâ are discussed. A definition of selectivity is given, and it is rec-. ommended that the use of this term be promoted and that the use of the term. âspecificityâ be discouraged. 1. INTRODUCTION. A very important quality criterion of an analytical method is its capability to deliver signals that are free.