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Definition of: thistle
Our photo definition of thistle 
(this′əl) noun
1. One of various vigorous prickly plants (genera Carduus, Cirsium, Cnicus, and Onopordum) with cylindrical or globular heads of tubular purple flowers; especially, the bull thistle (Cirsium lanceolatum) of Scotland, and the Canada thistle (Cirsium canadense).
2. Any of several prickly plants of other genera. [OE thistel]
—this′·tly adjective
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