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[Alteration (probably influenced by speedwell) of Middle English gromil, from Old French : gro-, of unknown meaning + mil, millet (from Latin milium; see millet).]
(Plants) any of various hairy plants of the boraginaceous genus Lithospermum, esp L. officinale, having small greenish-white, yellow, or blue flowers, and smooth nutlike fruits. See also puccoon1
[C13: from Old French gromil, from gres sandstone + mil millet, from Latin milium]
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|Noun||1.||gromwell - European perennial branching plant; occurs in hedgerows and at the edge of woodlands|
herb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests