Medical Definition of safe
: not causing harm or injury; especially : having a low incidence of adverse reactions and significant side effects when adequate instructions for use are given and having a low potential for harm under conditions of widespread availability <a list of drugs generally regarded as safe> <safe use in pregnancy has not been established—Emergency Medicine>
Learn More about safe
Seen and Heard
What made you want to look up safe? Please tell us where you read or heard it (including the quote, if possible).