| extinct | (adjective) no longer in existence; lost or especially having died out leaving no living representatives | Synonyms: nonextant |
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| (adjective) (of e.g. volcanoes) permanently inactive | - |
| (adjective) being out or having grown cold | Synonyms: out |
| extinction | (noun) the act of extinguishing; causing to stop burning | Synonyms: extinguishing, quenching |
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| (noun) a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus | Synonyms: experimental extinction |
| (noun) complete annihilation | Synonyms: extermination |
| (noun) the reduction of the intensity of radiation as a consequence of absorption and radiation | - |
| (noun) no longer in existence | Synonyms: defunctness |
| (noun) no longer active; extinguished | - |
| extinguish | (verb) put an end to; kill | Synonyms: snuff out |
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| (verb) kill in large numbers | Synonyms: annihilate, carry off, decimate, eliminate, eradicate, wipe out |
| (verb) terminate, end, or take out | Synonyms: do away with, eliminate, get rid of |
| (verb) extinguish by crushing | Synonyms: crush out, press out, stub, stub out |
| (verb) put out, as of fires, flames, or lights | Synonyms: blow out, quench, snuff out |
| extinguishable | (adjective) capable of being extinguished or killed | - |
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| extinguished | (adjective) of a conditioned response; caused to die out because of the absence or withdrawal of reinforcement | - |
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| extinguisher | (noun) a manually operated device for extinguishing small fires | Synonyms: asphyxiator, fire extinguisher |
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| extinguishing | (noun) the act of extinguishing; causing to stop burning | Synonyms: extinction, quenching |
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| extirpable | (adjective) capable of being totally destroyed or wiped out | Synonyms: exterminable |
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| extirpate | (verb) surgically remove (an organ) | - |
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| (verb) pull up by or as if by the roots | Synonyms: deracinate, root out, uproot |
| (verb) destroy completely, as if down to the roots | Synonyms: eradicate, exterminate, root out, uproot |
| extirpation | (noun) surgical removal of a body part or tissue | Synonyms: ablation, cutting out, excision |
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| (noun) the act of pulling up or out; uprooting; cutting off from existence | Synonyms: deracination, excision |
| extirpator | (noun) a farm implement used to remove weeds. | - |
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