orthodromy


From The Collaborative International Dictionary of English v.0.48:

Orthodromy \Or"tho*drom`y\ ([^o]r"th[-o]*dr[o^]m`[y^]; 277), n.
   [Cf. F. orthodromie.]
   The act or art of sailing on a great circle.
   [1913 Webster] Orthoepic
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