denier

Concise Oxford English Dictionary © 2008 Oxford University Press:
denier1 /ˈdɛnɪə/

▶noun

• 1 a unit by which the fineness of yarn is measured, equal to the weight in grams of 9,000 metres of the yarn.

• 2 a former French coin equal to one twelfth of a sou.

– origin ME (in sense 2): via OFr. from L. denarius (see denarius).

Concise Oxford English Dictionary © 2008 Oxford University Press:
denier2 /dɪˈnʌɪə/

▶noun a person who denies something.