Guanosine-5'-triphosphate (GTP) is a purine nucleotide triphosphate. Looking for the definition of GTP? Find out what is the full meaning of GTP on Abbreviations. Looking for online definition of GTP or what GTP stands for? GTP is. Comples organic compound in or register to gtp transformer rating capacity, a precursor to release energy. GTP Full Form is Gprs (general Packet Radio Service) Tunneling Protocol.