citadel

Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++cit·a·del /ˈsɪtədəl, -del/ noun [countable] 1. PMa strong fort (=small castle) built in the past as a place where people could go for safety if their city was attacked 城堡；要塞；堡垒 SYN fortress2 the citadel of something literaryPLACE a place or situation in which an idea, principle, system etc that you think is important is kept safe 保卫某事物的地方；某事物有保障的地方 SYN stronghold the last citadel of freedom 自由的最后堡垒

Examples from the Corpus

citadel• Outside this was a citadel, fortified like the inner bailey, but containing a greater number of buildings.• Whenever there was fighting around Limoges one permanent complicating factor was the rivalry between city and citadel.• With your help, and that of the Forteviot men, the main citadels may still be standing.• Far from being a challenger for power, it could not even hold on to its old citadels.• It seemed that the verderers were going towards the outlaws' citadel, not away from it.• New Zealand became the citadel of the new right.• In the citadel of St Martial everyone's nerves were on edge.Origin citadel (1500-1600) French citadelle, from Old Italian cittadella, from cittade “city”, from Latin civitas; → CITY

cit·a·del nounChineseSyllable

a strong castle) built a the (=small Corpus past as in fort

citadel
cit‧a‧del /ˈsɪtədəl, -del/

noun [countable]

Date: 1500-1600
Language: French
Origin: citadelle, from Old Italian cittadella, from cittade 'city', from Latin civitas; ⇨ city

1. a strong fort (=small castle) built in the past as a place where people could go for safety if their city was attacked
   SYN fortress
2. the citadel of something literary a place or situation in which an idea, principle, system etc that you think is important is kept safe
   SYN stronghold: