marrow.

1. Soft tissue inside bones, including tissue that produces blood cells.

2. The innermost or essential part of something.

3. A large mature summer squash, especially in British usage.

Use it for

Words that belong together

• bone marrow
• marrow cavity

On the page

The fracture exposed the pale marrow.

Usage notes

Primary category: horror / gothic. Forms: Usually uncountable; no ordinary plural in this sense. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Commonness: moderately common.