[n] the fatty network of connective tissue that fills the cavities of bones
[n] the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
[n] large elongated squash with creamy to deep green skins
[n] very tender and very nutritious tissue from marrowbones
[n] any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh
bone marrow, bone marrow, center, core, essence, gist, heart, heart and soul, inwardness, kernel, marrow squash, meat, nitty-gritty, nub, pith, substance, sum, vegetable marrow, vegetable marrow