Definition of wellington noun from the Oxford Advanced Learner's Dictionary

wellington

noun
ˈwelɪŋtən
 
; ˈwelɪŋtən
 
(also wellington boot, informal welly) (all British English) (North American English rubber boot)
 
one of a pair of long rubber boots, usually reaching almost up to the knee, that you wear to stop your feet getting wet
a pair of wellingtons