(sometimes offensive) dwarf (short person, especially one who suffers from dwarfism) / (by extension) anything that is small in stature or importance / (Germanic mythology, fantasy) dwarf (member of a short, underground humanoid race)

(Brazil, Internet slang) anon (an anonymous person)

(astronomy) dwarf planet (a celestial body the size of a planet but that has not cleared its orbit of other objects)

Alternative spelling of planeta anão

common box (Buxus sempervirens, a species of box tree)

plural of anão