Webster's English Dictionary

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centaury

cen.tau.ry \'sen-.to.r-e-\ n [ME centaure, fr. MF centaure`e, fr. ML 
   centaurea, fr. L ]centaureum, fr. Gk kentaureion, fr. Kentauros 1a: any of 
   a genus (Centaurium) of low herbs of the gentian family; (Xesp : an Old 
   World herb (C. umbellatum) formerly used as a tonic 1b: a related American 
   plant (genus Sabatia)  2: KNAPWEED