The Collaborative International Dictionary of English v.0.48:
Fairy \Fair"y\, a.
1. Of or pertaining to fairies.
2. Given by fairies; as, fairy money. --Dryden.
Fairy bird (Zool.), the Euoropean little tern (Sterna
minuta); -- called also sea swallow, and hooded tern.
Fairy bluebird. (Zool.) See under Bluebird.
Fairy martin (Zool.), a European swallow (Hirrundo ariel)
that builds flask-shaped nests of mud on overhanging
Fairy rings or Fairy circles, the circles formed in
grassy lawns by certain fungi (as Marasmius Oreades),
formerly supposed to be caused by fairies in their
midnight dances; also, the mushrooms themselves. Such
circles may have diameters larger than three meters.
Fairy shrimp (Zool.), a European fresh-water phyllopod
crustacean (Chirocephalus diaphanus); -- so called from
its delicate colors, transparency, and graceful motions.
The name is sometimes applied to similar American species.
Fairy stone (Paleon.), an echinite.