piano polish noun 1piano-polish verb 1forms 4 noun1 •French polish, formerly commonly used to surface pianos. piano-polish verb1 •To treat (furniture) with piano polish; French-polish.The papier mâché desk he passed tolerantly as bric-à-brac, but the china-cabinet was dismissed with contempt. "Deal stained black and piano-polished," he said. — 1950 formspiano-polished · piano-polishing · piano-polishes · piano polishes