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.

The CGS unit of acceleration, equal to 1 centimetre per second per second (1 centimeter per second squared, 1cm/s^2). Symbol: Gal

plural of galileo

A thermometer made of a sealed glass cylinder containing a clear liquid and several glass vessels of varying densities. As temperature changes, the individual floats rise or fall in proportion to their respective density.

(set theory) A demonstration of a surprising property of infinite sets. Some positive integers are squares while others are not; therefore, all the numbers, including both squares and non-squares, must be more numerous than just the squares; yet for every square there is exactly one positive number that is its square root, and for every number there is exactly one square; hence, there cannot be more of one than of the other.

plural of Galileo thermometer

plural of galileon

(physics) A theorised scalar field which is a local modification of gravity in some forms of string theory.