1) Writing medium 
Duchsustus (דוכסוסטוס, from Greek δυσχιστός 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 kelaf and gevil. The meanings of these terms, however, are the subject of controversy in Jewish law. Ac...