For an introduction to the topic, take a look at
ARMA's site. From their
Medieval & Renaissance Sword Forms and Companion Implements:
Medieval Swords
Medieval swords existed in great varieties over a number of centuries. Both experimentation and specialization in design was constant. But certain common characteristics can describe the "generic" medieval sword as a long, wide, straight, double-edged blade with a simple cross-guard (or "cruciform" hilt). It might be designed for one or two-hands. The typical form was a single hand weapon used for hacking, shearing cuts and also for limited thrusting. This style developed essentially from Celtic, Germanic, Anglo-Saxon, and late Roman (the spatha) forms. The Viking and early Frankish forms (the "spata") are also considered to be more direct ancestors. Medieval swords can be classified (typically by hilt design) into a great many categories by curators, collectors, and military historians. However, students & re-creationists today should prefer the actual historical terms. At the time, long bladed weapons were simply referred to as "swords", or for the longer ones often a "sword of war", "war-sword" (French Espée du Guerre or Epee du Guerre), or even a "long-sword". Various languages might call them by schwert, svard, suerd, swerd, espada, esapadon, or epee. When later worn on the belt by mounted knights they might be called an Arming-sword. Arming-swords were also considered "riding-swords" (also parva ensis or epee courte). It is this single-hand form which is so closely associated with the idea of the "knightly sword" (c. 1300). The challenge of armor in the Age-of-plate, forced many blades (both single-hand and longer) to be made narrower and pointier, but also thicker and more rigid. Ffrom at least the late 1300’s in England, a single-hand blade of this form was referred as a "short swerde". In 15th century Germany it was the Kurczen swert. At this same time, as a result of the increased use of thrusting techniques some blades adopted guards with knuckle-bars, finger-rings, and/or sides-rings which lead to the compound-hilt. In later Elizabethan times, older one-handed medieval type blades became known as "short-swords" while the larger variety were still referred to as "long-swords". The term "short sword" was used later by 19th century collectors to refer to any style of "shorter" one-handed swords typically from ancient times on.
The Broadsword
A term popularly misapplied as a generic synonym for medieval swords or any long, wide military blade. The now popular misnomer "broadsword" in reference to Medieval blades actually originated with collectors in the early 19th century -although many mistranslations and misinterpretations of Medieval literature during the 19th & 20th centuries have inserted the word broadsword in place of other terms. They described swords of earlier ages as being "broader" than their own contemporary thinner ones. Many 17th-19th century blades such as spadroons, cutlasses, and straight sabers are classed as broadswords as are other closed hilt military swords. The weapon known as the true broadsword is in fact a form of short cutlass. The term "broadsword" does not appear in English military texts from the 1570s - 1630s and noes not show up in inventories of sword types from the 1630's, and likely came into use sometime between 1619 and 1630. Descriptions of swords as "broad" before this time are only incidental and the word "broad" is used as an adjective in the same way "sharp" or "large" would be applied. Leading arms curators almost always list the broadsword specifically as a close-hilted military sword from the second half of the 17th century. Those cage and basket hilted blades used by cavalry starting in the 1640's were in form, "broadswords". During this time a gentleman's blade had become the slender small-sword, whereas the military used various cutting blades. Today, arms collectors, museum curators theatrical-fighters, and fantasy-gamers have made the word broadsword a common, albeit blatantly historically incorrect, term for the Medieval sword.
Long-Swords
The various kinds of long bladed Medieval swords that had handles long enough to be used in two hands were deemed long-swords (German Langenschwert/ Langes Swert or Italian spada longa). Long-swords, war-swords, or great swords are characterized by having both a long grip and a long blade. We know at the time that Medieval warriors did distinguished war-swords or great-swords ("grant espees" or "grete swerdes") from "standard" swords in general, but long-swords were really just those larger versions of typical one-handed swords, except with stouter blades. They were "longer swords", as opposed to single-hand swords, or just "swords". They could be used on foot or mounted and sometimes even with a shield. The term war-sword from the 1300's referred to larger swords that were carried in battle. They were usually kept on the saddle as opposed to worn on the belt. A 15th century Burgundian manual refers to both "great and small swords". As a convenient classification, long-swords include great-swords, bastard-swords, and estocs. In the 1200’s in England blunt swords for non-lethal tournaments were sometimes known as "arms of courtesy". There is a reference to an English tournament of 1507 in which among the events contestants are challenged to "8 strookes with Swords rebated". Wooden training weapons were sometimes called wasters in the 1200's or batons in the 1300's and 1400's. Knightly combat with blunt or "foyled" weapons for pleasure was known as à plaisance, combat to the death was à lóuutrance.