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marrow (n.)

"soft tissue found in the interior of bones," late 14c., from Old English mearg "marrow," earlier mærh, from Proto-Germanic *mazga- (source also of Old Norse mergr, Old Saxon marg, Old Frisian merg, Middle Dutch march, Dutch merg, Old High German marg, German Mark "marrow"), from PIE *mozgo- "marrow" (source also of Sanskrit majjan-, Avestan mazga- "marrow," Old Church Slavonic mozgu, Lithuanian smagenės "brain"). Figurative sense of "inmost or central part, inner substance, essence" is attested from mid-14c.

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Definitions of marrow from WordNet

marrow (n.)
the fatty network of connective tissue that fills the cavities of bones;
Synonyms: bone marrow
marrow (n.)
any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh;
Synonyms: marrow squash / vegetable marrow
marrow (n.)
very tender and very nutritious tissue from marrowbones;
Synonyms: bone marrow
marrow (n.)
large elongated squash with creamy to deep green skins;
Synonyms: vegetable marrow
marrow (n.)
the choicest or most essential or most vital part of some idea or experience;
Synonyms: kernel / substance / core / center / centre / essence / gist / heart / heart and soul / inwardness / meat / nub / pith / sum / nitty-gritty
From wordnet.princeton.edu