A balloon or container that glows due to chemiluminescent reactions occurring within it.
From chemi- (chemistry) + -loon (short for balloon). This is a relatively modern compound created to describe novelty items that produce light through chemical reactions rather than electricity.
Chemiloons are fascinating because they use the same chemistry as deep-sea creatures like anglerfish and jellyfish that create their own light—the glow sticks at concerts use the identical principle!
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