the unlawful use of drugs to enhance or inhibit the performance of an athlete, racehorse, or greyhound

all partners have come together in the fight against doping

they were due to be questioned on allegations of horse doping

he faces a ban for a positive doping test

administer drugs to (a racehorse, greyhound, or athlete) in order to enhance or inhibit sporting performance

the horse was doped before the race

smear or cover with varnish or other thick liquid

she doped the surface with photographic emulsion

add an impurity to (a semiconductor) to produce a desired electrical characteristic