quintain
noun
quin·tain ˈkwin-tᵊn 
: an object to be tilted at
especially : a post with a revolving crosspiece that has a target at one end and a sandbag at the other end
Word History
Etymology
Middle English quintaine, from Anglo-French, perhaps from Latin quintana street in a Roman camp separating the fifth maniple from the sixth where a market was held, from feminine of quintanus fifth in rank, from quintus fifth
First Known Use
15th century, in the meaning defined above