a plant or animal that is atypically small
"The rare dwarf bamboo thrives in the shaded garden corner, reaching only a few inches tall despite its usual species growing over twenty feet."
Any member of a race of beings from (especially Scandinavian and other Germanic) folklore, usually depicted as having some sort of supernatural powers and being skilled in crafting and metalworking, often as short with long beards, and sometimes as clashing with elves.
"The local legend claims that the ancient bridge was built by a dwarf who forged its iron arches before vanishing into the misty hills."
To render (much) smaller, turn into a dwarf (version).
"The new software update dwarfs its predecessor in terms of speed and efficiency."
Miniature.
"The dwarf tree in our garden is so small that it barely reaches waist height."