What is the meaning of Dno?

bottom (the lowest part)

vocative singular of dna

bottom (the lowest part of a container)

bottom (ground under the sea, ocean, river etc.)

vocative singular of dna

bottom

bottom

bottom (part furthest from the entrance opening of a cavity or hollow thing)

bottom (lowest and most solid part of a place where water rests or runs)

Source: wiktionary.org