1. (noun)ptomaine, ptomain any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria Synonyms: ptomaine, ptomainepoisoning, ptomain
2. (noun)ptomaine, ptomaine poisoning a term for food poisoning that is no longer in scientific use; food poisoning was once thought to be caused by ingesting ptomaines Synonyms: ptomaine, ptomainepoisoning, ptomain