From Ancient Greek πέντε (pente, “five”) + ἄκρον (akron, “summit”).
"pentacron." YourDictionary, n.d. Web. 09 December 2018. <https://www.yourdictionary.com/pentacron>.
pentacron. (n.d.). Retrieved December 09th, 2018, from https://www.yourdictionary.com/pentacron
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