noun, plural cas·tel·li [ka-stel-ahy] /kæˈstɛl aɪ/. Archaeology.
Examples from the Web for castellum
This castellum is a miniature embodiment of Roman taste and skill in architecture.
Under Drusus a castellum was erected here, which was destroyed by the Franks and the Alemanni.The Cathedrals and Churches of the Rhine|Francis Miltoun
It was then a question which word should prevail,—tour (turris), or chastel (castellum).The Story of London|Henry B. Wheatley
"There were giants in those days," said Lady Mabel, gravely, gazing on the castellum.
Every castle that they took was burned and destroyed, like Sir Ingelric's castellum at Speen.A Legend of Reading Abbey|Charles MacFarlane