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 VELOCITY: 1 The rate of change of displacement of a moving body with time: a vector expressing both magnitude and direction. Cf speed which is scalar. 2 For a wave, the distance travelled by a given phase divided by the time taken.