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Definition of sustainer

sustainer

/səˈsteɪ.nɚ/
sus · tain · er
Adverb:sustainably
•
Plural:sustainers
•
Adjective:sustainable
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sustainer Lexical Profile

sustainer Game Scores & Validity

• noun

1

A person or thing that supports, upholds, nourishes, or keeps something in existence.

Example

"Clean fresh water is an essential sustainer of life across all terrestrial ecosystems."

2

North American A donor who pledges ongoing, recurring financial contributions to a charity, non-profit organization, or public broadcaster.

Example

"The public radio station relies heavily on monthly sustainers to fund its independent journalism."

3

A rocket engine designed to remain attached to a launch vehicle and maintain its speed or altitude after the initial booster engines have separated.

Example

"Once the external boosters detached, the core sustainer continued firing until the spacecraft reached its target orbit."

Synonyms
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Antonyms
View all antonyms for sustainer

• Rhymes for sustainer

• Nearby Words

sustainably
sustained
sustainedly
sustainer
sustainment
sustenance
sutera

Cite this Entry

Wordmom. (2026). Definition of Sustainer. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/sustainer
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Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.