Definition of bidon:
(n) :
A bottle or flask for holding a beverage such as water or wine; (specifically, sports) a water bottle which can be squeezed to squirt the beverage out of the nozzle, especially (cycling) one designed for mounting on a bicycle.
(n) :
An oil drum; a petrol can.
(n) :
A cup made of wood.
(n) :
(archaic) A container for holding a liquid.