A skein, loop of cord, or tape used for making traction on a part of the fetus. fillet. 1. a loop, as of cord or tape, for making traction on the fetus. 2. in the nervous system, a long band of nerve fibers. fillet. n. 1. A narrow strip of ribbon or similar material, often worn as a headband. 2. also filet (fĭ-lā′, fĭl′ā′) a. A strip or compact piece of boneless meat or fish, especially the beef tenderloin. b. A boneless strip of meat rolled and tied, as for roasting.