Read the dictionary definition of extinct. All definitions for this word.
1. (of e.g. volcanos) permanently inactive
1. an extinct volcano
2. being out or having grown cold
1. threw his extinct cigarette into the stream
2. the fire is out
3. no longer in existence; lost or especially having died out leaving no living representatives
1. an extinct species of fish
2. an extinct royal family
3. extinct laws and customs