[trahy-seyl; Naut. trahy-suh
l] 
| a triangular or quadrilateral sail having its luff hooped or otherwise bent to a mast, used for lying to or keeping a vessel headed into the wind; spencer. |
| try·sail (trī'səl, -sāl') n. A small fore-and-aft sail hoisted abaft the foremast and mainmast in a storm to keep a ship's bow to the wind. [From obsolete try, a lying to, heaving to.] |