The plural form referring to multiple compounds or molecules that each contain two methyl groups, or a general category of dimethyl-containing chemicals.
From dimethyl + -s (English plural marker). This is the plural form allowing discussion of multiple dimethyl compounds as a class.
When chemists say 'dimethyls,' they're often referring to a whole family of related compounds sharing the two-methyl structure—it's like saying 'apples' instead of listing every red, green, and honeycrisp variety.
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