Avogadro,
Amedeo (Conte di Quaregna e Ceretto) 1776-1856; It. chemist & physicist
See Avogadro in American Heritage Dictionary 4
(äˌvə-gäˈdrō, äˌvō-), Amedeo 1776-1856.
Italian chemist and physicist who advanced the hypothesis that has come to be called Avogadro's law. From this hypothesis other physicists were able to calculate Avogadro's number.