agar
🇺🇸
/ˈeɪɡɑːr/
🇬🇧
/ˈeɪɡɑː(r)/
A gelatinous substance derived from seaweed, used in scientific experiments and the food industry to create a solid or semi-solid base for growing bacteria or other microorganisms, or to thicken and stabilize certain foods.
Researchers used agar to create a petri dish for growing bacteria in their experiment.