The process of making a sort of sweet barley soup which is then fermented
is called "mashing". The vessel in which this is done is called a "mashing tun". The soup is called the mash.
After mashing the malt
for sufficient time to convert the starch
in the grains into sugar
, one sparges
the spent grains to get all the sweet liquid off them. These grains are then useful for cattle feed or fertilizer, but in my experience they aren't much good in bread