fat hen noun4 •Thin-leaf orach (Atriplex prostrata). •(UK) White goosefoot (Chenopodium album), a fast-growing weedy annual plant cultivated in some places and a weed elsewhere. •(UK) Other species, such as Good King Henry (Blitum bonus-henricus) •Hen and chicks, a group of small succulent flowering plants native to Europe and northern Africa