The word travelled from Medieval Latin through Anglo-French and Middle English. Its earliest recorded English noun use names a patterned fabric.
The sequence stops at the documented Medieval Latin form; it does not score a deeper Greek analysis.
Sources
- Merriam-Webster: diaper
The route is explicit and the earliest noun record points to patterned fabric.
- Online Etymology Dictionary · diaper
Meanings of the older forms on the word path.
- Collins Dictionaries · diaper
Meanings of the older forms on the word path.
- Anglo-Norman Dictionary · diaspre
Meanings of the older forms on the word path.