cistern vs lavage

cistern

• In a flush toilet, the container in which the water used for flushing is held; a toilet tank. 

• The vessel surrounding the condenser in a steam engine. 

• A cisterna. 

• A reservoir or tank for holding water, especially for catching and holding rainwater for later use. 

lavage

• A washing. 

• A washing of a hollow organ. 

• To wash a hollow organ