plexus
US /ˈplek.səs/
UK /ˈplek.səs/
1.
a network of nerves or vessels in the body
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The solar plexus is a complex network of nerves located in the abdomen.
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Damage to the brachial plexus can cause weakness or numbness in the arm.
2.
a complex or intricate network or system of interconnected parts
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The city's transportation plexus is a marvel of modern engineering.
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The novel explores the complex plexus of human relationships.