what does fillet mean
Full Definition of FILLET. 1. : a ribbon or narrow strip of material used especially as a headband. 2. a: a thin narrow strip of material b: a piece or slice of boneless meat or fish; especially: the tenderloin of beef.3.a: a concave junction formed where two surfaces meet (as at an angle) b: a strip that gives a rounded appearance to such a junction; also: a strip to reinforce the corner where two surfaces meet.: a thin narrow strip of material b: a piece or slice of boneless meat or fish; especially: the tenderloin of beef. 3. a: a concave junction formed where two surfaces meet (as at an angle) b: a strip that gives a rounded appearance to such a junction; also: a strip to reinforce the corner where two surfaces meet.