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[uhn-der-sahyd] /ˈʌn dərˌsaɪd/
an under or lower side.
Origin of underside
1670-80; under- + side1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for underside
Contemporary Examples
Historical Examples
  • The underside of the top can be bevelled at the edge (Fig. 319).

    Woodworking for Beginners Charles Gardner Wheeler
  • Upon the underside of one of its sleeves there is a big ink blob.

    Sundry Accounts Irvin S. Cobb
  • T is squeezed between the regular nut on the bolt and an extra one on the underside of it.

    How Two Boys Made Their Own Electrical Apparatus Thomas M. (Thomas Matthew) St. John
  • The wire should now be protected from touching the bird on its underside.

    Practical Taxidermy Montagu Browne
  • The room was some ten feet long, by eight feet wide, and seven feet high to the underside of the beams.

    The Castaways Harry Collingwood
  • He laid the phone down and looked to the underside viewscreen.

    Space Viking Henry Beam Piper
British Dictionary definitions for underside


the bottom or lower surface
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for underside

c.1680, from under + side (n.). Cf. Dutch onderzijde, Danish underside, German unterseite.

Online Etymology Dictionary, © 2010 Douglas Harper
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