The Spanish adjective 'filoso' (meaning 'sharp-edged') comes from combining the Spanish noun 'filo' (meaning 'edge' or 'blade') with the suffix '-oso' (meaning 'full of' or 'having'). The noun 'filo' itself derives from the Latin word 'filum', which meant 'thread' or 'edge'. Over time, the meaning evolved from the concept of a thin thread to focus more specifically on the cutting edge or blade of an object.

A simpler and more common Spanish word that shares this etymology is 'filo' itself, which directly means 'edge' or 'blade'. When you encounter 'filoso', you can think of it as simply meaning 'having a sharp edge' or 'having a good blade'.

The Latin root 'filum' meaning 'thread' has given English several related words. The most common ones include 'filament' (a thin thread-like structure), 'file' (originally a line or row of things arranged like a thread), and 'profile' (originally meaning 'to draw in outline', from the concept of a thread-like line). While these English words maintained the 'thread-like' aspect of the original meaning, the Spanish words 'filo' and 'filoso' developed along the 'edge' meaning of the Latin root.