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subsill

noun
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sub·​sill | \ ˈsəb+ˌ- \

Definition of subsill

: a secondary sill (as under a shop front or on a mudsill)

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History and Etymology for subsill

sub- + sill

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“Subsill.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/subsill. Accessed 20 January 2020.

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