The Spanish word 'dulce' meaning 'sweet' comes directly from the Latin word 'dulcis', which also meant 'sweet'. Interestingly, this Latin word existed alongside the Ancient Greek word 'glykýs' (meaning 'sweet' as well), though they developed independently despite their similar meanings.

Many common Spanish words are derived from 'dulce', including 'dulcería' (candy store), 'dulzura' (sweetness), and 'endulzar' (to sweeten). These words all maintain the core meaning related to sweetness or pleasant taste.

While English took many of its 'sweet' related words from the Germanic route, we can still find traces of the Latin 'dulcis' in English words like 'dulcet' (sweet, melodious), 'dulcimer' (a sweet-sounding musical instrument), and in scientific terms like 'dulcify' (to sweeten). The word 'glucose' comes from the related Greek root 'glykýs'.