Pronunciation: (ik-stingkt'), [key]
1. no longer in existence; that has ended or died out: an extinct species of fish.
2. no longer in use; obsolete: an extinct custom.
3. extinguished; quenched; not burning.
4. having ceased eruption; no longer active: an extinct volcano.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.