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insubmergible from in- entry 1 + submerge + -ible; insubmersible probably from French, from in- in- entry 1 + Latin submersus (past participle of submergere to submerge) + French -ible
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“Insubmergible.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/insubmergible. Accessed 4 Jul. 2022.
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