Dartmoor is a place name in Devon, England, compounded of the River Dart + 'moor' ('open upland'); the river name is of Celtic origin, perhaps meaning 'oak (stream)'. In present use as a noun, it means "a moorland region of Devon, England, known for its granite tors", keeping the historical formation close to the word's ordinary semantic work. As a compound, its meaning is assembled from the two visible parts rather than from an opaque borrowing. The modern form is therefore best understood through the stated historical form and present sense, without adding an unsupported chain of cognates or intermediate stages.