Correct spelling for the English word "grossart" is [ɡɹˈə͡ʊsɑːt], [ɡɹˈəʊsɑːt], [ɡ_ɹ_ˈəʊ_s_ɑː_t] (IPA phonetic alphabet).
In many districts, a familiar name for a gooseberry.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.