Webster's English Dictionary

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delphinium

del.phin.i.um \del-'fin-e--*m\ n [NL, genus name, fr. Gk delphinion 
   larkspur, dim. of delphin-, d]elphis dolphin : any of a large genus 
   (Delphinium) of the crowfoot family of chiefl y perennial erect branching 
   herbs that have palmately divided leaves and irregular flowers in showy 
   spikes and include several that are poisonous