submarine
nounUK /ˌsʌb.məˈriːn/
US /ˌsʌb.məˈriːn/
A submarine is a boat that can go under the water.
The submarine dived deep into the ocean.
OTHER MEANINGS
2. A long bread roll split and filled with meat, cheese, or salad.
I ate a turkey submarine for lunch.
3. A sea creature or plant that lives below the surface of the sea.
Scientists study submarine life near the coral reef.
4. Existing or happening under the sea.
The submarine volcano erupted quietly on the ocean floor.