Webster's Revised Unabridged Dictionary · 1913

Decembrist

Decembrist , noun

(Russian Hist.) One of those who conspired for constitutional government against the Emperor Nicholas on his accession to the throne at the death of Alexander I., in December, 1825; -- called also Dekabrist.
He recalls the history of the decembrists... that gallant band of revolutionists. — G. Kennan