I understand that "hairs" is plural when talking about multiple hairs, as in "my hairs have split ends", and that "hair" is singular when talking about one's collection of hairs, such as "my hair is blue". However, I'd like to know what the plural form is when I am talking about the collections of hairs of multiple people.
We must wait until our ______ dry.
Furthermore, if the answer is "hair", then would it be "We must wait until our hair dry." or "We must wait until our hair dries."?
Best Answer
Hair can be either hair or hairs when pluralised, but the hair(s) of a group should be hair. I have three grey hairs, but we all have brown hair.
My hair, your hair, our hair.
Hair is usually hairs when it's countable, and hair when uncountable. As an uncountable, it becomes a mass noun.