From Longman Dictionary of Contemporary Englishpianofortepi‧an‧o‧for‧te /piˌænəʊˈfɔːti $ -noʊˈfɔːrteɪ/ noun [countable] old-fashioned a piano
Examples from the Corpus
pianoforte• After his retirement this became the well-known pianoforte manufacturing firm of Collard & Collard.• Incidentally, brother Louis was then taking lessons on the pianoforte.• I believe there's to be music later - I saw Miss Pendlebury's maid putting her music on the pianoforte. 