A Dominican friar.
A member of a radical French political club founded (at an old Jacobin convent) in 1789 and one of the driving forces of the French Revolution.
*2002 , , The Great Nation , Penguin 2003, p. 429-30:
*:The Jacobins acted as a left-of-centre parliamentary pressure group, spending much of their time in coordinating the following day's business in the Assembly.
By extension, a political radical.
A breed of domestic pigeon (known for its feathered hood over its head).
*Collins Shorter English Dictionary
*Napoleon - a biography by Frank McLynn Pages 209-10, 212, 213, 220,221,222,224,233,
a person who holds extreme views, especially one who advocates such views; a radical or fanatic
holding extreme views, especially on a political subject
of, or relating to extremism