1. 
   Orthodromy
   Or'tho·drom`y noun [ Confer French orthodromie .] The act or art of sailing on a great circle.
   Found op http://www.encyclo.co.uk/webster/O/35
   
   
2. 
   Orthodromy
   • (n.) The act or art of sailing on a great circle.
   Found op http://thinkexist.com/dictionary/meaning/orthodromy/
   
   
3. 
   orthodromy
   orthodromy The art of sailing in a direct course, or on the arc of a great circle, which is the shortest distance between any two points on the surface of the globe; great-circle sailing.
   Found op http://www.wordinfo.info/words/index/info/view_unit/1515/4
   
   

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