The term 'ODE ON A GRECIAN URN' is a poem written by the English poet John Keats in 1819. The poem is an example of a type of poetry known as an ode, which is a lyrical poem that expresses strong emotion. The poem is about an ancient Greek URN and the emotions it evokes in the speaker. The crossword solution for the term 'ODE ON A GRECIAN URN' is URN, which is an acronym for Unfired Refractory Material.