the official seal (=special circle-shaped design) printed on important documents, used to prove that a document is from the US government. The seal has two sides, and on one side is a picture of a bald eagle (=the national bird of the US), and on the other side is a picture of a pyramid with an eye above it. Both designs are printed on the back of a one-dollar bill.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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