Definition. Good health, mental , physical & spiritual, leads to enjoyment of life to its fullest. Wealth without good health cannot provide any quality to your life. Thus goes this saying! health leads to wealth, but not vice versa!
See below. If you're sick, you end up spending money on doctors, meds, and home and/or hospital stay. If you're healthy, you can work to multiply your wealth. However, it's probably more about balance -- if you know how to achieve balance, it's a part of health. Everyone will put a slightly different twist on his/her definition. Now, it's your turn to think what your question means for you.