Keep" boya ja istilah sané  kanggén ring masa abad pertengahan. Istilah punika kanggén duk abad ka-16 miwah salanturnyané. Salanturnyané "donjon" kanggén nuntun kawéntenan menara sané  ageng utawi toris ring sajeroning basa Latin.
Keep" was not a term used in the medieval period – the term was applied from the 16th century onwards – instead "donjon" was used to refer to great towers, or turris in Latin.