The term 'RADIUS, FOR ONE' is a crossword solution that can be broken down into two words. The first word is 'BONE, ' which is a four-letter word meaning a rigid connective tissue found in vertebrates. The second word is 'ARMBONE, ' which is a seven-letter word referring to the BONE in the arm that connects the elbow to the shoulder. Together, these two words refer to the radius, which is one of the two long bones in the forearm that connects the elbow to the wrist.