Definitions for quintainˈkwɪn tn
Random House Webster's College Dictionary
an object mounted on a post or attached to a movable crossbar mounted on a post, used as a target in the medieval sport of tilting.
Origin of quintain:
The street in a Roman military camp separating the fifth and sixth manipels
An object to be tilted at in jousting, often a sandbag hanging from a post.
an object to be tilted at; -- called also quintel