A type of siliceous sponge spicule (tiny internal skeleton piece) shaped like a disk with six radiating arms.
From disco- (disk-shaped) + hexaster (from Greek hex, meaning six, and aster, meaning star). The term comes from marine biology and the scientific study of sponge anatomy.
Sponge spicules are among nature's tiniest architectural marvels—a discohexaster looks like a microscopic six-pointed star on a disk, and thousands of them form the sponge's invisible skeleton under the ocean!
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