/rohch/ , Chem.
an alumlike substance derived from alunite.
[ 1400-50; roche cliff, rocky height (now obs.), late ME (see ROCK 1 ); appar. partial trans. of MF alum en roque, alun de roche ]
/rohch/ , Chem.
an alumlike substance derived from alunite.
[ 1400-50; roche cliff, rocky height (now obs.), late ME (see ROCK 1 ); appar. partial trans. of MF alum en roque, alun de roche ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012