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yam

1 ENTRIES FOUND:
yam /ˈjæm/ noun
plural yams
yam
/ˈjæm/
noun
plural yams
Britannica Dictionary definition of YAM
[count]
1 
: a long, thick root of a tropical plant that has rough brown skin and usually white or yellow flesh and that is eaten as a vegetable
2 
US : sweet potato