To irradiate something means to expose it to radiation, which is a form of energy that travels in waves or particles. When scientists irradiate food, they expose it to carefully controlled radiation that kills bacteria and other germs without making the food radioactive or unsafe to eat. This helps the food stay fresh longer, similar to how pasteurizing milk uses heat to kill harmful bacteria.

Doctors also irradiate certain medical equipment to sterilize it before surgery. Cancer patients might receive radiation treatment, where doctors carefully irradiate tumors to destroy cancer cells while trying to protect healthy tissue around them.

The word can also mean to light something up brightly. When morning sunlight streams through a window, it irradiates the room, filling it with light. A lighthouse beam irradiates the dark ocean at night.

While radiation sounds scary because high doses can be dangerous, controlled radiation has many helpful uses in medicine, food safety, and science. The key is using the right amount for the right purpose, under careful supervision.