PLANCHET Meaning of PLANCHET in English [ 'plan(t)ʃɪt ]■ noun a plain metal disc from which a coin is made.OriginC17: dimin. of earlier planch 'slab of metal', from OFr. planche 'plank, slab'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004