Sentence:  [“]The Empire has always been a realm of colossal resources. They've calculated everything in planets, in stellar systems, in whole sectors of the Galaxy. Their generators are gigantic because they thought in gigantic fashion. ... / To supply light and heat to a city, they have motors six stories<!-- [sic] --> high — I saw them — where ours could fit into this room. And when I told one of their atomic specialists that a lead container the size of a walnut contained an atomic generator, he almost choked with indignation on the spot. / Why, they don't even understand their own <WSD>colossi</WSD> any<!-- page break --> longer. The machines work from generation to generation automatically, and the caretakers are a hereditary caste who would be helpless if a single D-tube in all that vast structure burnt out.[”] 
Meaning of the word marked with <WSD> tags:  Any creature or thing of gigantic size.