A needle-like structure with disc-shaped or wheel-shaped ends found in certain sponges.
From Greek 'amphi-' (both sides) and 'diskos' (disc or wheel). The term was coined by marine biologists studying sponge spicules in the 19th century.
These microscopic structures look like barbells under a microscope and help sponges filter-feed by anchoring mucus nets—nature's way of building the perfect plumbing system.
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