Definition of fat hen
1
: any of several succulent or fleshy-leaved plants especially of the genus Chenopodium (as lamb's-quarters)
2
: any of certain plants of the genus Atriplex (especially A. lastata and A. patula)
3
: ground ivy
5
: shepherd's purse
6
: mugwort sense 1
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Merriam-Webster unabridged
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