Webster's English Dictionary

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thistle

this.tle \'this-*l\ \'this-(*-)le-\ n [ME thistel, fr. OE; akin to OHG 
   distill thistle] : any of various prickly composite plants (esp. genera 
   Carduus, C ircium, and Onopordon) with often showy heads of mostly tubular 
   flowers; also : any of various other prickly plants - this.tly aj