Pianist
来自Big Physics
mid 19th century: from French pianiste, from piano (see piano1).
wiktionary
From French pianiste, from Italian pianista. Analyzable as piano + -ist.
etymonline
pianist (n.)
"a performer on the pianoforte," 1822, from French pianiste, from Italian pianista; see piano + -ist. Earlier in English in the French form, pianiste (1816).