denoting or relating to an extremely high-security prison or part of a prison, intended for particularly dangerous prisoners
（关押特别危险的罪犯的监狱或牢房）戒备最森严的。
a supermax prison
戒备最森严的监狱, 顶级监狱。
词源
1970s: shortened from super-maximum, i. e. 'greater than the expected or conventional maximum'.