Definition of delphinium
: any of a large genus (Delphinium) of the buttercup family that comprises chiefly perennial erect branching herbs with palmately divided leaves and irregular flowers in showy spikes and includes several that are poisonous — compare larkspur
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Merriam-Webster unabridged
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Time Traveler for delphinium
The first known use of delphinium was in 1664
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