1. (

• marrow ,
• bone_marrow

) the fatty network of connective tissue that fills the cavities of bones ;

2. (

• marrow ,
• marrow_squash ,
• vegetable_marrow

) any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh ;

3. (

• marrow ,
• bone_marrow

) very tender and very nutritious tissue from marrowbones ;

4. (

• marrow ,
• vegetable_marrow

) large elongated squash with creamy to deep green skins ;

5. (

• kernel ,
• substance ,
• core ,
• center ,
• centre ,
• essence ,
• gist ,
• heart ,
• heart_and_soul ,
• inwardness ,
• marrow ,
• meat ,
• nub ,
• pith ,
• sum ,
• nitty-gritty

) 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" ;