merepõhi tähendus null.

ground▼◼◼◼[UK: ɡraʊnd] [US: ˈɡraʊnd]

bed▼◼◼◻[UK: bed] [US: ˈbed]

bottom of the sea▼◼◼◻

seabed [seabeds]▼◼◻◻noun
[UK: ˈsiː.bed] [US: ˈsiː.ˌbed]

seafloor [seafloors]▼◼◻◻noun