GT

WordReference Random House Unabridged Dictionary of American English © 2025

GT, 

1. Automotive, Weights and Measures gigaton;
   gigatons.
2. Automotive Also called GT car, grand touring car, grand touring. 
   • an automobile in the style of a coupe, usually seating two but occasionally four, and designed for comfort and high speed.
   • a high-speed, two-door model of a four-door sedan.

gt., 

1. gilt.
2. great.
3. Drugs (in prescriptions) a drop.
• Latin gutta
• (def. 3)

Collins Concise English Dictionary © HarperCollins Publishers::

GT abbreviation

1. gran turismo: a high-performance luxury sports car with a hard fixed roof, designed for covering long distances