The term 'BONE fish' can be broken down into four crossword solutions: ULNA (4 letters), FILET (5 letters), OSTE (4 letters), and OSTEO (5 letters). The ULNA is the BONE in the forearm that runs from the elbow to the wrist. The FILET is a cut of fish that has been boned and skinned. OSTE is a prefix meaning 'BONE' and OSTEO is a suffix meaning 'BONE-related'. Together, these four solutions provide an overview of the term 'BONE fish', which refers to a type of fish that has bones.