variants:
or co-surfactant
plural cosurfactants or co-surfactants
Definition of cosurfactant
: a chemical substance that is used in addition to a surfactant to improve its performance
especially
: a second surfactant that is used in conjunction with a primary surfactant
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Merriam-Webster unabridged
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Time Traveler for cosurfactant
The first known use of cosurfactant was in 1970
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