nounpl. hanko, or han·kos
A Japanese stamp made of wood, stone, or horn, engraved with the name of an individual, office, or institution and used instead of a signature in official transactions.
Origin of hankoJapanese hanko probably alteration ( taken as if han seal, stamp ) ( ko child, also a noun-forming suff. ) of earlier hankō publication, printing Japanese han board, block such as those used in woodblock printing ( from Middle Chinese pa&tricolon;n´ ) ( also the source of Mandarin bàn )Japanese kō to go, circulate ( from Middle Chinese x&hhook;ja&tricolon;j&njlig; ) ( also the source of Mandarin xíng )