minisub

[ min-ee-suhb ]
/ ˈmɪn iˌsʌb /

noun

a small submarine, holding only one or a few persons, used in naval operations, underwater exploration, or conducting underwater experiments.

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Origin of minisub

First recorded in 1955–60; mini- + sub
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020