Esophageal cancer describes the disease where cells that line the esophagus change or mutate and become malignant. These cells grow out of control and form a mass or tumor. There are two main types of esophageal cancer:
Trajectory. A trajectory is the path that a moving object follows through space as a function of time. The object might be a projectile or a satellite, for example. It thus includes the meaning of orbitâthe path of a planet, an asteroid or a comet as it travels around a central mass.
Definition of orbit. 1  1a : a path described by one body in its revolution about another (as by the earth about the sun or by an electron about an atomic nucleus); also : one complete revolution of a body describing such a pathb : a circular path. 2  2 : a range or sphere of activity or influence within the president's orbit.