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from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun Galileo Galilei (1564-1642), an Italian thinker and key figure in the scientific revolution who improved the telescope, made astronomical observations, and put forward the basic principle of relativity in physics.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun Italian astronomer and mathematician who was the first to use a telescope to study the stars; demonstrated that different weights descend at the same rate; perfected the refracting telescope that enabled him to make many discoveries (1564-1642)

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