Definition of "horology" [ho•rol•o•gy]

• The science of measuring time. (noun)
• The art of making timepieces. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "On an unseasonably warm December afternoon 10 years ago tomorrow, everyone who was anyone in the obsessive world of watch collecting-formally known as horology-packed Sotheby's seventh-floor, wood-paneled auction gallery in New York."
• "Until the 1950s, when the first highly accurate atomic clocks were built, the day was simply determined by the rotation of the Earth, said Jonathan Betts, senior curator of horology at the Royal Observatory."
• "Today, the 51-year-old drug developer works in Singapore, where he manages a horology enthusiasts' website on the side, called ThePuristSPro.com , which was started in 2006."