: of, relating to, or being a grammatical case (see case entry 1 sense 3a) that typically marks a person, place, or thing from which someone or something else is separated or the source from which someone or something comes, and is also frequently used to indicate the cause of an event or condition or the instrument by which an action is accomplished see also ablative absolute
ablative noun
1
: of or relating to ablation
2
: tending to ablate
ablative material on a nose cone
ablatively adverb

Examples of ablative in a Sentence

Recent Examples on the Web
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Adjective
The heat shield is made of Avcoat, an ablative material that burns away bit by bit, which carries heat away from the capsule. Stephen J. Beard, USA Today, 9 Apr. 2026 At its base is a heat shield made of an ablative mixture called Avcoat, reformulated from the Apollo era. IEEE Spectrum, 29 Jan. 2026 An investigation determined the cause was a buildup of gasses inside the outer ablative material of the heat shield. Jay Bennett, Wired News, 24 Mar. 2026 The ablative thermal barrier burned away unevenly as the craft reentered the atmosphere, but Orion still made it to a safe, on-target splashdown. Stephen Clark, ArsTechnica, 10 Apr. 2026 See All Example Sentences for ablative

Word History

Etymology

Adjective (1)

Middle English ablatif, borrowed from Anglo-French or Latin; Anglo-French ablatif, borrowed from Latin ablātīvus, from ablātus, suppletive past participle of auferre "to carry away, remove" + -īvus -ive — more at ablate

Adjective (2)

ablate + -ive

First Known Use

Adjective (1)

circa 1500, in the meaning defined above

Adjective (2)

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of ablative was circa 1500

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Cite this Entry

“Ablative.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ablative. Accessed 7 Jul. 2026.

Medical Definition

ablative

adjective
: relating to or involving surgical ablation
ablative treatment
ablative techniques
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