an edible tuber native to South America; a staple food of Ireland
"After years of famine, they finally found enough potatoes in the cellar to survive the winter."
An Irish or white potato.
"The farmer planted rows of murphy potatoes in the damp soil to see if they would survive the frost."
A common Irish surname, from Irish, the anglicized form of Irish Ó Murchadha
"After years of searching for his ancestral roots, John finally traced his family line back to a distant relative named Murphy who lived in County Cork."