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)
1967, in the meaning defined above
“Nonoxynol-9.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nonoxynol-9. Accessed 1 Dec. 2023.
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