Volatile

1. n. A winged animal; wild fowl; game.
2. a. Passing through the air on wings, or by the buoyant force of the atmosphere; flying; having the power to fly.
3. a. Capable of wasting away, or of easily passing into the aeriform state; subject to evaporation.
4. a. Fig.: Light-hearted; easily affected by circumstances; airy; lively; hence, changeable; fickle; as, a volatile temper.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.