1. 
   Tribulum
   (Latin) wooden sled pulled over wheat to separate the chaff.
   Found op http://ablemedia.com/ctcweb/glossary/glossaryi.html
   
   
2. 
   tribulum
   (from the article `agriculture, origins of`) ...ears as the vehicle was pushed through the crop. The grain was threshed in the long-established way, by animals treading it on a firm floor, or by ...
   Found op http://www.britannica.com/eb/a-z/t/78
   
   
3. 
   tribulum
   1) Wooden sled pulled over wheat to separate the chaff
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/tribulum/1
   
   

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