1967, in the meaning defined above
nonyl (the radical C9H19) + oxy- + phenol + 9 (from the fact that the compounds it contains have an average of nine ethylene oxide groups per molecule)
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“Nonoxynol-9.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nonoxynol-9. Accessed 6 Jul. 2022.
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