Naismith's rule

British

/ ˈneɪsmɪθs /

noun

mountaineering a rule of thumb for calculating the time needed for a climbing expedition, allowing 1 hour for every 3 miles of distance plus 1 hour for every 2000 feet of height

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of Naismith's rule

C19: named after W. W. Naismith (1856–1935), Scottish climber, who formulated it

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Y.M.C.A. missionaries introduced the game in Tianjin in 1895 and, using a Chinese translation of Naismith’s rule book, spread it widely.

From New York Times

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023