Marrow

n. soft fatty tissue in the interior cavity of the bones (Anatomy); vitality; essential part; zucchini, variety of squash

Marrow can meanbone marrow, the interior of long bonesvegetable 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.
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Noun
1. the fatty network of connective tissue that fills the cavities of bones
(synonym) bone marrow
(hypernym) connective tissue
(hyponym) red marrow, red bone marrow
(part-holonym) bone, os
2. any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh
(synonym) marrow squash, vegetable marrow
(hypernym) summer squash, summer squash vine, Cucurbita pepo melopepo
(hyponym) zucchini, courgette
(part-meronym) vegetable marrow
3. very tender and very nutritious tissue from marrowbones
(synonym) bone marrow
(hypernym) dainty, delicacy, goody, kickshaw, treat
(part-holonym) marrowbone
4. large elongated squash with creamy to deep green skins
(synonym) vegetable marrow
(hypernym) summer squash
(part-holonym) marrow squash, vegetable marrow
5. 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"
(synonym) kernel, substance, core, center, essence, gist, heart, heart and soul, inwardness, meat, nub, pith, sum, nitty-gritty
(hypernym) content, cognitive content, mental object
(hyponym) bare bones

(v. t.)
To fill with, or as with, marrow of fat; to glut.
  

(n.)
The tissue which fills the cavities of most bones; the medulla. In the larger cavities it is commonly very fatty, but in the smaller cavities it is much less fatty, and red or reddish in color.
  

(n.)
The essence; the best part.
  

(n.)
One of a pair; a match; a companion; an intimate associate.
  

The bone marrow.