1. (

• extinct ,
• nonextant ,

) no longer in existence; lost or especially having died out leaving no living representatives; "an extinct species of fish"; "an extinct royal family"; "extinct laws and customs" ;

2. (

• extinct ,

) (of e.g. volcanos) permanently inactive; "an extinct volcano" ;

3. (

• extinct ,
• out

) being out or having grown cold; "threw his extinct cigarette into the stream"; "the fire is out" ;