Webster's English Dictionary

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trajectory

tra.jec.to.ry \tr*-'jek-t(*-)re-\ n [NL trajectoria, fr. fem. of 
   trajectorius of passing, fr. L traj]ectus, pp. of traicere to cause to 
   cross, cross, fr. trans-, tra- trans- + jacere to throw - more at JET : the 
   curve that a body (as a planet or comet in its orbit, a projectile i n 
   passing from muzzle to first point of impact, or a rocket) describes in 
   space