mamaoa
1. (noun) steam, vapour.
I te ata rawa ka kitea te wai e kōkiri ake ana i te moana, ā i kapi katoa taua wāhi i te mamaoa (TWMNT 11/8/1874:206). / In the morning the water was seen rising above the sea and that place was covered with vapour.
See also koromamahu, koromamao