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Definition:
the middle of the 3 meninges
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- araroba (Definition: a bitter yellow powder used to treat skin diseases)
- arbitrageur (Definition: someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential))
- archaeopteryx lithographica (Definition: extinct primitive toothed bird of the Upper Jurassic having a long feathered tail and hollow bones; usually considered the most primitive of all birds)
- arachnoid membrane
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