TDR

TDR may refer to:

==Science and technology== Interstate TDR, WWII US Navy aerial drone Telecommunications for Disaster Relief, a proposed standard Time-delay relay, a relay that opens an closes with a certain timing Time-domain reflectometry, a measuring method Time-domain reflectometer, an instrument used for time-domain reflectometry Throttleable ducted rocket, a type of air-augmented rocket motor ===Medicine=== Radiolabeled thymidine (TdR) Totally drug-resistant, the ability of a microbe to resist the effects of all known drugs