Which word can be defined as control or protection?

Question

Quizplus · Accepted Answer

Aegis: control or protection.
"The staffing changes were made under the aegis of the hospital staffing coordinator."
Panacea: cure, solution, or remedy. Panacea is typically used to describe a "cure-all" or "magic bullet."
"The new parameters put in place were the panacea for all protocol infractions."
Lysis refers to the gradual decline of disease symptoms or the disintegration of a cell by rupture of the cell wall or cell membrane.
Milieu refers to the environmental condition or setting.
"The milieu of the hospital waiting room was full of anxiety and anticipation."

Which Word Can Be Defined as Control or Protection