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hair

The noun "hair" can be both countable and uncountable.

hair → uncountable

Meaning: the mass of fibres on your head

Example sentence: I had lots of long, thick hair when I was young, but now I'm totally bald.

hair → countable

Meaning: a single strand of hair

Example sentence: She pulled a hair from her boyfriend's head and wound it around her finger.

Quick Quiz:

In which sentence is the word "hair" uncountable?

a. The police tested several of the hairs they found to see if the DNA matched.

b. None of the strands of hair they tested matched the DNA.

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Contributor: Matt Errey