
• (n.) See Byssus, n., 1.
Found on 
http://thinkexist.com/dictionary/meaning/byss/
 Byss  noun
Byss  noun  See 
 Byssus , 
 noun , 1. 
Found on 
http://www.encyclo.co.uk/webster/B/120

byssin, byss 1. A cloth of exceedingly fine texture, used by the ancients. It is disputed whether it was of cotton, linen, or silk.  2. A tuft of long, tough filaments which are formed in a groove of the foot, and issue from between the valves of certain bivalve mollusks; such as the, Pinna and Mytilus, by which they attach themselves to rocks, etc...
Found on 
http://www.wordinfo.info/words/index/info/view_unit/341/
  No exact match found.