A type of sword first introduced in the early 1400’s. C.E., It's the hardest type to define with the designation usually meant in terms of a set of qualities that were being introduced to the field in that era, hence the name.
As a generalization, they usually had the same length as long-swords, 40-48 inches, and nearly the same weight, 3-3.5 pounds; but they differed in the switch-hitting handle that could be comfortably used in a one-handed or dual-handed fashion, and the inclusion of annelets and side-rings. These improvements were added to further the new need for better point control and maneuverability to catch up to the advancements in armor and foil them.
Medieval Swordsmanship, by John Clements
European Weapons and Armor, by R.E. Oakeshott