Decembrist \De*cem"brist\, n. (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. Dekabrist \Dek"a*brist\, n. A Decembrist.