fau ‧ cet /ˈfɔːsət, ˈfɔːsɪt $ ˈfɒː-/ BrE AmE noun [countable] American English
[ Date: 1300-1400 ; Language: Old French ; Origin: fausset 'something that closes a hole in a container' , from Late Latin falsare 'to make false' ]
the thing that you turn on and off to control the flow of water from a pipe SYN tap British English