Marrow can mean bone marrow, the interior of long bones vegetable marrow, a variety of squash, or a large courgette (zucchini in US English) Marrow, a character in the X-Men comic series. Marrow (novel), Sci-Fi Book written by Robert Reed. The Marrow Controversy, occasioned by the republication of The Marrow of Modern Divinity in 1718.… (More on Marrow)