An Elf

(Norse mythology) A luminous spirit presiding over nature and fertility and dwelling in the world of Álfheim (Elfland). Compare angel, nymph, fairy.
Any from a race of mythical, supernatural beings resembling but seen as distinct from human beings. They are usually delicate-featured and skilled in magic or spellcrafting; sometimes depicted as clashing with dwarves, especially in modern fantasy literature.
(fantasy) Any of the magical, typically forest-guarding races bearing some similarities to the Norse álfar (through Tolkien's Eldar).
A very diminutive person; a dwarf^[1].
(South Africa) The bluefish (Pomatomus saltatrix).