bommie
/ˈbɒmi/noun Australian informal
A submerged offshore reef: it’s an isolated bommie that rises 30m from the sandy seabed...
- He led us out into the blue to the bommie, which rose from the depths.
- Our dive site was the top of a bommie, 25 metres deep, a short swim away from the wall.
- It's is a small bommie at the end of the reef, joined by a low saddle of coral.
Origin
1940s: abbreviation of bombora.