Capable of being extinguished, put out, or eliminated; able to be made extinct.
From 'extinguish' + '-able' (capable of being). The term has been in English since the 17th century when discussing both literal fire and metaphorical concepts like rights, hopes, or species.
In legal documents, you'll see the term 'extinguishable rights' meaning rights that can be legally terminated—it's a great example of how the same word works for everything from fire to legal status!
Complete word intelligence in one call. Free tier — 50 lookups/day.