The term 'able to walk' can be summarized by two crossword solutions: 'AMBULANT' (8 letters) and 'AMBULATORY' (10 letters). AMBULANT is an adjective that means able to walk, while AMBULATORY is an adjective that means able to move about or walk. Both words are derived from the Latin word ambulare, which means to walk or move about. These words are often used in medical contexts to describe a person's ability to walk or move around.