Definition of the 1 000 Guineas from the Oxford Advanced Learner's Dictionary

 

the 1 000 Guineas

 
BrE
 
; NAmE
 
(also the Thousand Guineas)
 
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(officially the 1 000 Guineas Stakes) a horse race that takes place at Newmarket in eastern England every year in April or May. It is a flat race (= one without jumps) for female horses that are three years old, and the course is 1 mile/1.6 kilometres long. It is one of the most important horse races in Britain and was first run in 1814.