tra-jec-to-ry (tra-jek'to-ri), n. [ pl. -ries (-riz)]

tra-jec-to-ry (tra-jek'to-ri), n. [ pl. -ries (-riz)], the curve
described by a body moving through space, as the path of a bullet
discharged from a gun: Geom., the curve or surface that cuts all the
curves or surfaces of a given system at a fixed angle…..


http://www.geocities.com/firstpulseproj/Borderhack.html