the fatty network of connective tissue that fills the cavities of bones
"The doctor ordered a bone marrow biopsy to check for signs of leukemia in the patient's blood cells."
any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh
"The farmer harvested a bushel of marrow to make a creamy soup."
very tender and very nutritious tissue from marrowbones
"The chef carefully scooped out the rich, creamy marrow from the roasted bones to serve as a luxurious sauce for the pasta."
large elongated squash with creamy to deep green skins
"The chef selected a marrow from the garden because its skin was turning a rich, dark green."
the choicest or most essential or most vital part of some idea or experience
"the gist of the prosecutor's argument"
"the heart and soul of the Republican Party"
"the nub of the story"
The substance inside bones which produces blood cells.
"After years of living apart, they finally reunited as old marrow."
A friend, pal, buddy, mate.
In plain English: Marrow is the soft, fatty tissue found inside bones that helps make blood cells and stores energy.
"The soup was rich and creamy because we added fresh bone marrow to the pot."
Usage: Use marrow to refer specifically to the nutrient-rich tissue found at the center of bones that generates blood cells. Do not use it as a synonym for "friend," even though some dialects occasionally employ this meaning informally.
A surname.
"The famous jazz musician Marrow performed at the downtown festival last night."
Marrow comes from the Old English word mearg, which traces its roots back to Proto-Indo-European origins meaning "marrow" or specifically bone marrow. The term entered modern usage through Middle English forms like mary and has long been associated with the soft substance found inside bones, though it shares a distant ancestor with words for brain in several other languages.