bis 1
/bis/ , adv.
1. twice.
2. again (used interjectionally as an enthusiastic call for the repetition of a musical performance).
[ 1810-20; duis TWICE ]
bis 2
/bis/ , n.
a sheer, often embroidered linen, used in the manufacture of altar cloths.
Also, bisso .
[ 1350-1400; ME byssus BYSSUS ]