Definition of nonoxynol–9
: a spermicide used in contraceptive products
Origin of nonoxynol–9
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)
First Known Use: 1980
Seen and Heard
What made you want to look up nonoxynol–9? Please tell us where you read or heard it (including the quote, if possible).