A thick, solid, irregular mass or bump of something; also means to put things together in a group without distinguishing differences.
From Middle Low German 'lumpe' or Scandinavian sources, first appearing in English around 1400s. Originally described a shapeless mass, and the verb form developed later to mean 'to group together.'
In medicine, finding a 'lump' is different from finding a 'mass' or 'nodule'—the word choice matters because doctors use different terminology to communicate size, density, and concern level to specialists!
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