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