Etymology
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thistle (n.)

prickly herbaceous plant, Old English þistel, from Proto-Germanic *thistilaz (source also of Old Saxon thistil, Old High German distil, German Distel, Old Norse þistell, Danish tidsel), of uncertain origin; perhaps from an extended form of PIE root *steig- "to prick, stick, pierce." Emblematic of Scotland since 15c.

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Definitions of thistle

thistle (n.)
any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves;
From wordnet.princeton.edu