Sentence:  Jubal said that his night-sight probably came from the conditions in which he had grown up , and Mike grokked this was true but grokked that there was <WSD>more</WSD> to it ; his foster parents had taught him to see . 
Meaning of the word marked with <WSD> tags:  (comparative of `much' used with mass nouns) a quantifier meaning greater in size or amount or extent or degree