A plant with delicate, feather-like leaves or fronds; likely another name for a finely divided plant like yarrow or similar species.
Compound of 'feather' and 'foil' (an archaic/poetic term for leaves or fronds). Named descriptively for the feathery appearance of its foliage.
The word 'foil' for leaves comes from Old French 'foille,' and it's the same root in botanical terms today—this shows how medieval herbalists named plants by their most striking visual feature.
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