hy·​per·​gol·​ic ˌhī-pər-ˈgä-lik How to pronounce hypergolic (audio)
: igniting upon contact of components without external aid (such as a spark)
: of, relating to, or using hypergolic fuel
hypergolically adverb

Examples of hypergolic in a Sentence

Recent Examples on the Web Also, holding both a large amount of methane or hypergolic chemical internally is explosively problematic. Kyle Hill, Discover Magazine, 2 Jan. 2014 Lasting about 2 minutes and 40 seconds, the video shows instances where Pythom employees appear to be handling the Eiger rocket and its hypergolic propellants with less than industry-standard care. Eric Berger, Ars Technica, 15 Apr. 2022 Jiuquan currently only handles launches of older hypergolic Long March rockets and solid rockets, necessitating a new complex. Eric Berger, Ars Technica, 21 Jan. 2022 Unlike its predecessor, the Titan II used hypergolic propellant, with fuel and oxidizer stored in the missile—at room temperature—and mixed to launch almost instantaneously. Vince Guerrieri, Popular Mechanics, 18 Sep. 2020

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hypergolic.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


German Hypergol a hypergolic fuel, probably from hyper- + erg- + -ol (hydrocarbon)

First Known Use

1947, in the meaning defined at sense 1

Time Traveler
The first known use of hypergolic was in 1947

Dictionary Entries Near hypergolic

Cite this Entry

“Hypergolic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hypergolic. Accessed 18 Apr. 2024.

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