barometer (n.) Look up barometer at Dictionary.com
1660s, from Greek baros "weight," from suffixed form of PIE root *gwere- (2) "heavy" (see grave (adj.)) + -meter. The name probably was coined (and certainly popularized) by English scientist Robert Boyle (1627-1691). The instrument was invented 1643 by Italian physicist Evangelista Torricelli and was at first known as the Torricelli tube.