eczema

The word 'eczema' entered English in the mid-18th century via modern Latin, directly from the Greek 'ekzema', which means 'eruption' or 'something thrown out by heat'. This Greek term itself derives from the verb 'ekzein', meaning 'to boil over' or 'to break out', a compound of 'ek-' (out) and 'zein' (to boil). The original Greek imagery vividly captures the condition's appearance: the skin seeming to 'boil over' or 'erupt' with inflammation and weeping lesions. This ancient, literal description of a physical process evolved into the precise, modern medical term for a specific category of inflammatory skin disease.

The word is a simplex loanword from Greek. It does not neatly segment into meaningful, reusable morphemes in modern English based on its current spelling.