Related Clues:

• Gel in biology class, perhaps
• Cultural milieu
• Lab medium
• It helps a culture develop
• Lab gelatin
• Salt additive
• Microbiologist's medium
• Cultural medium?
• Petri-dish gel, perhaps
• Petri dish layer
• Petri dish gelatin
• When repeated, it's Malay for "jelly"
• Ice-cream thickener
• Gel made from seaweed
• Gelling agent in some foods