This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of thistle.

"So, too, while in our meadows we purposely propagate tender fodder plants, like grasses and clovers, we find on the margins of our pastures and by our roadsides only protected species; such as thistles, houndstongue, cuckoo-pint, charlock, nettles"

bristles    dismissals    missiles    whistles