marrow >> ˈmarəʊ
Definition: [noun] a long white-fleshed gourd with green skin, which is eaten as a vegetable.
Definition: [noun] the plant of the gourd family which produces marrows.
Definition: [noun] a soft fatty substance in the cavities of bones, in which blood cells are produced.
Example: marrow donors
Definition: [noun] the essential part of something.
Example: such men were the marrow of the organization