air-breather

or air·breath·er

[ air-bree-ther ]
/ ˈɛərˌbri ðər /

noun

an aircraft, missile, or submarine engine that requires air from the atmosphere for the combustion of its fuel.

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Question 1 of 7
What does “vacillate” mean?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020