What does serm mean?

Class of drug. Serms are used for a variety of conditions..Breast cancer prevention, osteoporosis and treatment of breast cancer.. They also have some side effects that are important to consider.....Best answer will come when more information given.
Drug class. Selective estrogen-receptor modulator. Here are a couple of resources: http://goo.Gl/qbmyj and http://sgoti.Ws/wydvmf.