cuff link

or cuff·link

noun

one of a pair of linked ornamental buttons or buttonlike devices for fastening a shirt cuff.

Origin of cuff link

First recorded in 1895–1900

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for cufflinks

cuff link

noun

one of a pair of linked buttons, used to join the buttonholes on the cuffs of a shirt

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