n. 1 (in full vegetable marrow) a a large usu. white-fleshed edible gourd used as food. b the plant, Cucurbita pepo, yielding this. 2 a soft fatty substance in the cavities of bones, often taken as typifying vitality. 3 the essential part. to the marrow right through. marrowless adj. marrowy adj.
[ OE mearg, mrg f. Gmc ]