SEA FLOOR Meaning of SEA FLOOR in English ˌsea ˈfloor BrE AmE British English , sea‧floor American English /ˈsiːflɔː $ -flɔːr/ noun the sea floor the land at the bottom of the sea SYN seabed Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012