/ ˈfɪlɪt; NAmE fɪˈleɪ/ noun , verb
■ noun
( NAmE also filet ) [ C , U ] a piece of meat or fish that has no bones in it :
plaice fillets
a fillet of cod
fillet steak
■ verb
[ vn ] to remove the bones from a piece of fish or meat; to cut fish or meat into fillets
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WORD ORIGIN
Middle English (denoting a band worn round the head): from Old French filet thread, based on Latin filum thread.