A small blue jellyfish-like creature that floats on the ocean surface, related to the Portuguese man o'war.
From 'blue' plus 'button,' named for its small, button-like or disc-shaped blue body that floats on the sea.
Bluebuttons are tiny ocean travelers that drift with currents and can wash ashore in huge numbers—sailors have reported seeing vast 'carpets' of them floating on the surface, creating an eerie but beautiful blue-colored ocean.
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