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bioluminescence light given off naturally by certain kinds of insects, fish, or bacteria. The bioluminescence of fireflies allows them to blink on and off in the dark.
blink When you blink, your eyes close and then open again very quickly. When we blink, it happens so fast that we usually don't notice it. Blinking is important, though, because it keeps our eyes from getting dry. [1/2 definitions]
eyelid Your eyelid is the skin that covers the part of your eye that you see with. When your eyelid is down, we say your eye is closed. When it is up, we say your eye is open. When you blink, you move your eyelids very quickly.
wink to close and open both eyes quickly; blink. [1/5 definitions]