adverb, numeral, verb · the smallest amount; used in the negative to mean 'not at all'

我对他所说的话毫不怀疑。

measure word · a unit of currency equivalent to one-tenth of a yuan

这张旧纸币上面印着五毫。

verb · fine hair or a writing brush made from such hair

他拿起毛笔，在纸上挥毫。

measure word · a unit of measurement representing one thousandth, such as a millimeter

这张纸的厚度只有几毫米。