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.
path noun [ C ] (TRACK) 1  A2 a route or track between one place and another, or the direction in which something is moving: 2  B2 a set of actions, especially ones that lead to a goal or result: âº 3  a way or track made by or for people walking on the ground, or a line along which something moves: