Haldir (source)

elf

1828 Webster's Dictionary
noun  plural: elves 
1.  A wandering spirit; a fairy; a hobgoblin; an imaginary being which our rude ancestors supposed to inhabit unfrequented places, and in various ways to affect mankind.  Hence in Scottish, elf-shot is an elf-arrow; an arrow-head of flint, supposed to be shot by elfs; and it signifies also a disease supposed to be produced by the agency of spirits.
2.  An evil spirit; a devil.
3.  A diminutive person.

Personally, I do not care for this definition.  I much rather prefer the image of Tolkien's Elves.  :]

“At the hill’s foot Frodo found Aragorn, standing still and silent as a tree; but in his hand was a small golden bloom of elanor, and a light was in his eyes. He was wrapped in some fair memory: and as Frodo looked at him he knew that he beheld things as they had been in this same place. For the grim years were removed from the face of Aragorn, and he seemed clothed in white, a young lord tall and fair; and he spoke words in the Elvish tongue to one whom Frodo could not see. Arwen vanimelda, namarië! He said, and then he drew a breath, and returning out of his thought he looked at Frodo and smiled.

`Here is the heart of Elvendom on earth,’ he said, `and here my heart dwells ever, unless there be a light beyond the dark roads that we still must tread, you and I. Come with me!’ And taking Frodo’s hand in his, he left the hill of Cerin Amroth and came there never again as a living man.” 
― J.R.R. Tolkien, The Fellowship of the Ring

Tenna enta lúmë, mellon!

(Until [next] time, friend!)