• synonyms


  1. the lower part or side: The underpart of the plane's fuselage scraped the treetops.
  2. an auxiliary or secondary part or role.
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Origin of underpart

First recorded in 1655–65; under- + part
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for underpart

Historical Examples

  • We had the underpart of the slab on our side, and I did not think of looking when we took it down.

    On the Irrawaddy

    G. A. Henty

  • The underpart of the foot forms a tube called the funnel (or siphon).

  • The underpart of the body is furnished with a single row of large plates.

    Reptiles and Birds

    Louis Figuier

  • Springing in a slow, graceful curve from the underpart of the body over the forecarriage is a splasher of crimson patent leather.

  • The female differs in having the outside of the limbs and the underpart of the body blackish.