(comparative more ultracool, superlative most ultracool)
ultra- + cool
"ultracool." YourDictionary, n.d. Web. 14 December 2018. <https://www.yourdictionary.com/ultracool>.
ultracool. (n.d.). Retrieved December 14th, 2018, from https://www.yourdictionary.com/ultracool
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