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bottom board

noun
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Definition of bottom board

1 : the base or floor of a beehive
2 bottom boards plural : removable boards inside a boat at the bottom to protect the outer planking

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“Bottom board.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bottom%20board. Accessed 14 Jul. 2020.

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