alkanet
Concise Oxford English Dictionary © 2008 Oxford University Press:
alkanet /ˈalkənɛt/
▶noun a plant of the borage family with a hairy stem and blue flowers. [Pentaglottis sempervirens and other species.]
– origin ME: from colloq. Arab. al-ḥannat (Arab. al-ḥinnā') ‘the henna shrub’.
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