Jacobin
noun
Jac·o·bin ˈja-kə-bən 
1
: dominican
2
[French, from Jacobin Dominican; from the group's founding in the Dominican convent in Paris] : a member of an extremist or radical political group
especially : a member of such a group advocating egalitarian democracy and engaging in terrorist activities during the French Revolution of 1789
Jacobinic
ˌja-kə-ˈbi-nik
adjective or Jacobinical
ˌja-kə-ˈbi-ni-kəl
Jacobinism
ˈja-kə-bə-ˌni-zəm
noun 
Word History
Etymology
Middle English, from Anglo-French jacopin, from Medieval Latin Jacobinus, from Late Latin Jacobus (St. James); from the location of the first Dominican convent in the street of St. James, Paris
First Known Use
14th century, in the meaning defined at sense 1