Hi Gonzalo,
Good note there! Actually though, in the complete confusion of terminology, these 'spadroons' or whatever you call them

actually on occasion it seems I have seen referred to as 'straight sabres' , perhaps in reference to thier manner if use, again the cut and thrust conundrum. I cannot place exactly which places I have seen this, but it was certainly a bit of an anomaly. I know that of course fencing sabres are with straight blade, and the early 20th c. produced swords such as the British M1908, American Patton M1913 and the Spanish M1907 'Puerto Seguro' all with straight blades were often termed 'sabres', obviously contrary to the standard definition, alluding more to issue cavalry swords.
In Arabic, the term sa'if (=sword) can be equally applied to sabres and pallasch type swords.
All the best,
Jim