marchioness
Concise Oxford English Dictionary © 2008 Oxford University Press:
marchioness /ˌmɑːʃəˈnɛs, ˈmɑːʃ(ə)nɪs/
▶noun
- 1 the wife or widow of a marquess.
- 2 a woman holding the rank of marquess in her own right.
– origin C16: from med. L. marchionissa, fem. of marchio(n-) ‘ruler of a border territory’.
'marchioness' also found in these Oxford entries:

