Sa ‧ mar ‧ i ‧ tan /səˈmærət ə n, səˈmærɪt ə n/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: From the Bible story of a person from Samaria (an area of ancient Palestine) who stopped and helped a man who had been attacked and robbed ]
good Samaritan someone, especially a stranger, who helps you when you have problems or need something