/ˈmeroʊ/ noun, pl -rows
1 [noncount] : a soft substance that fills the bones of people and animals — called also bone marrow
2 [count, noncount] Brit : a large, long vegetable with dark green skin
We were frozen to the marrow. [=we were very cold]
The look in his eyes chilled me to the marrow. [=made me feel very fearful]
Useful english dictionary. 2012.