bull thistle bull terrier • bull through · · · Info · Definitions · Synonyms · Characters · · bull thistle · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States. Synonyms: bull thistle, boar thistle, spear thistle, Cirsium vulgare, Cirsium lanceolatum. · · Noun Definition 1 Synonyms · · · boar thistle · · Synonym 1 spear thistle · · Synonym 2 cirsium vulgare · · Synonym 3 cirsium lanceolatum · · Synonym 4 Characters · · space U+0020 b latin small letter b U+0062 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075