|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|1.||the fatty network of connective tissue that fills the cavities of bones|
|2.||the vital part; essence|
|5.||(Brit) short for vegetable marrow|
|[Old English mærg; related to Old Frisian merg, Old Norse mergr]|
marrow mar·row (mār'ō)
The spinal cord.