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insole

[in-sohl]
noun
  1. the inner sole of a shoe or boot.
  2. a thickness of material laid as an inner sole within a shoe, especially for comfort.
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Origin of insole

First recorded in 1850–55; in + sole2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for insole

insole

noun
  1. the inner sole of a shoe or boot
  2. a loose additional inner sole used to give extra warmth, comfort, etc
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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

Word Origin and History for insole

n.

1850s, from in + sole.

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Online Etymology Dictionary, © 2010 Douglas Harper