IPA: /zɑrf/ (z ar f)
Noun A term who's first documented English usage was in 1936.
It is a form of heat insulating device that goes over a cup filled with a warm substance (originally coffee) to protect the drinker from being burned. originally, zarfs were made of metal and could even have a handle on them.
This term came from the Arabic word زارف /zarifon/ meaning "an object used to carry something within."