What is a circumfix?

Definition
	A circumfix is an affix made up of two separate parts which surround and attach to a root or stem.
	The morphological process whereby this is achieved is called circumfixation.

Example (Tuwali Ifugao, Philippines)
	The circumfix ka--an is a nominalizer and surrounds a root. baddang: root ‘help’ v. ka--an: circumfix ‘NOMR’ kabaddangan: word ‘helpfulness’

Generic
	A circumfix is a kind of
	What is an affix? (Linguistics)