The phrase “posthumous” is pronounced as “PAH-st(h)yuh-muhs”. It’s an adjective meaning “occurring, revealed, or produced after the dying of the individual to whom it’s attributed”.
The phrase is commonly used to explain artistic endeavors, literature, or music which might be launched after the artist’s dying. For instance, the novel “The Silmarillion” by J.R.R. Tolkien was revealed posthumously in 1977, 4 years after his dying.