ثرو

مُثْرَاةٌ مثراه مثراة A cause of multiplying, or rendering abundant; syn. مَكْثَرَةٌ: so in the saying, هٰذَا مَثْرَاةٌ لِلْمَالِ [ This is a cause of multiplying, or rendering abundant, cattle, or other property ]. (S, K.)