Duchsustus (, from Greek  dyschistos) is the name of a type of parchment used for religious writings in Judaism.  It is originally a Greek word and one of three Talmudic names for animal skin.  The other two are  and . The meanings of these terms, however, are the subject of controversy in Jewish law. According to the Talmud, a  should, ideally, be written on , but may also be on ,  must be written on , and  may be written on , , or . This instruction is dated to Moses at Mount Sinai.  is the animal's dermis,  is the epidermis, and  is both layers tanned and unseparated.

Jewish law and rituals
Talmud
Writing media
Leather in Judaism
Greek words and phrases in Jewish law