pentagon
/ˈpentəgən/noun
1
- a plane figure with five straight sides and five angles五边形。
2
the Pentagon
the pentagonal building serving as the headquarters of the US Department of Defense, near Washington DC五角大楼（美国国防部总部, 位于华盛顿特区附近）。
2.1
- the US Department of Defense美国国防部：
the Pentagon said 19 of its soldiers had been killed.
美国国防部声称有19个士兵被杀。
派生词
pentagonal
adjective词源
late 16th cent.: via Latin from Greek pentagōnon, neuter (used as a noun) of pentagōnos 'five-angled'.