The Spanish word 'sudor' (meaning 'sweat') comes directly from the Latin word 'sudor', which had the same meaning. The Latin 'sudor' was formed from the verb 'sudare' ('to sweat') combined with the suffix '-or', which was used to create nouns indicating the result of an action. This formation pattern literally creates a word meaning 'the result of sweating' - sweat itself.

Some related Spanish words include 'sudar' (to sweat), which is the verb form, and 'sudadero' (sweatband), which adds the suffix '-ero' to indicate an item related to sweat. These words maintain the same 'sud-' root that carries the core meaning related to sweat.

While English 'sweat' comes from a different Germanic root, we do have some English words related to 'sudor' through Latin. These include 'sudorific' (causing sweat), 'transude' (to pass through as a sweat), and 'exude' (which originally meant 'to sweat out' but now more generally means 'to ooze out'). The scientific term 'sudoriferous' meaning 'sweat-producing' (as in 'sudoriferous glands') also preserves this Latin root.