名詞 citadel:

1. a stronghold into which people could go for shelter during a battle
   同義詞：bastion

1. The fortified height or citadel of an ancient Greek city.
   衛(wèi)城古希臘城市的設(shè)防的城堡或要塞
2. This citadel is built on high ground for protecting the city.
   這座城堡建于高處是為保護(hù)城市。
3. Here was a citadel in the Second World War.
   在二戰(zhàn)中，這兒是一處避難所。

cit.a.del

n.（名詞）
A fortress in a commanding position in or near a city.
城堡：在一個(gè)城市內(nèi)或其附近的處于控制地位的堡壘
A stronghold or fortified place; a bulwark.
要塞：一個(gè)堅(jiān)固或得到加固的地方；堡壘

來源：
French citadelle
法語(yǔ) citadelle
from Italian cittadella [diminutive of] città [city]
源自 意大利語(yǔ) cittadella [] città 的小后綴 [城市]
from Latin covit3s * see city
源自 拉丁語(yǔ) covit3s *參見 city