Real Dictionary

Galileo in American English
(born Galileo Galilei) 1564-1642; It. astronomer, mathematician, & physicist: with the telescope, which he improved, he demonstrated the truth of the Copernican theory: condemned for heresy by the Inquisition
noun: a U.S. space probe designed to take photographs and obtain other scientific information while orbiting the planet Jupiter; burned up in the planet's atmosphere in 2003

Galileo in British English 1
noun: full name Galileo Galilei. 1564–1642, Italian mathematician, astronomer, and physicist. He discovered the isochronism of the pendulum and demonstrated that falling bodies of different weights descend at the same rate. He perfected the refracting telescope

Galileo in British English 2
noun: a US spacecraft, launched 1989, that entered orbit around Jupiter in late 1995 to study the planet and its major satellites; burned up in the planet's atmosphere in 2003