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marrow.

The substance inside bones which produces blood cells.

6 characters2 syllables approx.English language

Meaning & usage

noun/ˈmæɹəʊ/Received-Pronunciation/ˈmæɹoʊ//ˈmɛ(ə)ɹoʊ/
  1. The substance inside bones which produces blood cells.

    uncountable
  2. A kind of vegetable similar to a large courgette, zucchini or squash; the mature fruit of certain Cucurbita pepo cultivars.

    countable · uncountable
  3. The pith of certain plants.

    countable · uncountable
  4. The essence; the best part.

    countable · figuratively · uncountable
  5. The inner meaning or purpose.

    countable · figuratively · uncountable
  6. Bone marrow biopsy.

    colloquial · countable
    This patient will have a marrow today.
  7. Semen.

    obsolete · uncountable
Where this word comes from

From Middle English mary, marow, marwe, marowȝ, from Old English mearg, from Proto-West Germanic *maʀg, from Proto-Germanic *mazgą, *mazgaz, from Proto-Indo-European *mosgʰos. Compare West Frisian moarch, Dutch merg, German Mark, Swedish märg, Icelandic mergur, and also Russian мозг (mozg, “brain”), Polish mózg (“brain”), Ashkun amōźã, Kamkata-viri muč, muj, Waigali muj, Persian مغز (maġz, “brain”), Sanskrit मज्जन् (majján). Doublet of maghaz.

noun
  1. A friend, pal, buddy, mate.

    Geordie · informal
    Cheers marrow!
  2. A miner's mate or assistant.

    obsolete · slang
  3. One of a pair; a match; a companion; an intimate associate.

    Scotland · archaic
Where this word comes from

From Old Norse margr.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.