1. the soft fatty tissue that fills the cavities of bones
2. the essential or most important part of something
Usage: figurative
3. a type of large squash with creamy flesh
Usage: chiefly British

Examples

• The doctor explained that bone marrow produces blood cells.
• She donated bone marrow to help save her brother’s life.
• The cold wind chilled him to the marrow.
• His speech got to the marrow of the problem.
• The story revealed the marrow of human nature.
• They grew marrows in their vegetable garden.
• The marrow was stuffed with rice and herbs.