su·per·firm
| \ ˌsü-pər-ˈfərm
\
\
Definition of superfirm
: extremely firm
superfirm mattresses
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“Superfirm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/superfirm. Accessed 26 Feb. 2021.
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Time Traveler for superfirm
The first known use of superfirm was in 1928
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