A more thorough explanation:

aegrotus

Aegrotus means being sick or unwell due to an illness.

• After catching the flu, John felt aegrotus and had to stay in bed for a week.
• When Sarah broke her leg, she became aegrotus and had to use crutches to move around.

The examples show that aegrotus is used to describe someone who is not feeling well due to an illness or injury. John caught the flu and felt aegrotus, while Sarah broke her leg and became aegrotus. Both examples illustrate the meaning of aegrotus as being sick or unwell due to an illness.