(comparative more ultracool, superlative most ultracool)
ultra- + cool
"ultracool." YourDictionary, n.d. Web. 29 May 2019. <https://www.yourdictionary.com/ultracool>.
ultracool. (n.d.). Retrieved May 29th, 2019, from https://www.yourdictionary.com/ultracool
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