Plymstock is a civil parish and commuter suburb of Plymouth in the English county of Devon. The earliest surviving documentary reference to the place is as Plemestocha in the Domesday Book and its name is derived from Old English meaning either "outlying farm with a plum-tree" or, if it is short for Plympton Stock, "outlying farm belonging to Plympton". Frequent buses connect most areas of Plymstock with routes across the city linking with the railway station and Derriford hospital. There is a water-taxi linking Mountbatten with Plymouth Barbican.