submarine
adjective/ˌsʌbməˈriːn/, /ˈsʌbməriːn/
/ˌsʌbməˈriːn/, /ˈsʌbməriːn/
[only before noun] (specialist)- existing or located under the sea
- submarine plant life
- submarine cables
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submarine
Definition of submarine adjective from the Oxford Advanced Learner's Dictionary