Trajectory. Used in meteorology to denote the path taken by any particular particle of air when moving over Earth's surface. In gunnery, is the path of the projectile from gun muzzle to the surface of Earth, or to its bursting position.
Trammel. Fishing net made up of a 40-fathom length of small mesh net between two 40-fathom lengths of large mesh net. Extended between two ropes moored in line of tide. Tramontana. North wind in Mediterranean Sea.