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underside

[uhn-der-sahyd] /ˈʌn dərˌsaɪd/
noun
1.
an under or lower side.
Origin of underside
1670-1680
1670-80; under- + side1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for underside

underside

/ˈʌndəˌsaɪd/
noun
1.
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
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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