Webster's English Dictionary

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taraxacum

ta.rax.a.cum \t*-'rak-si-k*m\ n [NL, genus name, fr. Ar 
   tsub-dot>arakhshaqu-n wild chicory] : the dried rhizome and roots of the 
   dandelion (Taraxacum officinale ) used as a diuretic, a tonic, and an 
   aperient