Question

What other English words that refers to a large, defended living space comes from castra?

Answer 1

the Roman Republic and the Roman Empire, the Latin word castrum[1] (plural castra) was a building, or plot of land, used as a fortified military camp. In English, the terms 'Roman fort', 'Roman camp' and 'Roman fortress' are commonly used for castrum. However, scholastic convention tends toward the use of the words 'fort', 'camp', 'marching camp' and 'fortress' as a translation of castrum.[2]