Used especially in flavoring soup

• A bone containing edible marrow

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
late 14c., from marrow + bone (n.). A poetic Old English word for "bone" was mearhcofa "marrow-chamber."

Wikipedia Word definitions in Wikipedia
Marrowbone may refer to the following places: Marrowbone, Cumberland County, Kentucky Marrowbone, Pike County, Kentucky Marrowbone Township, Moultrie County, Illinois Marrowbone Lane in Dublin, Ireland

WordNet Word definitions in WordNet
n. a bone containing edible marrow; used especially in flavoring soup

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Marrowbone \Mar"row*bone`\, n. A bone containing marrow; pl. ludicrously, knee bones or knees; as, to get down on one's marrowbones, i. e., to kneel.

Wiktionary Word definitions in Wiktionary
n. A bone containing edible marrow.