What does propeller mean?
A propeller is a mechanical device with rotating blades that pushes an aircraft, boat, or other vehicle through air or water. In an aircraft, the propeller drives air backward, and the resulting reaction force produces forward thrust; marine propellers work similarly, with their blades acting like screws in water. The word is also used metaphorically for a person or force that drives an activity or project forward. In everyday aviation and maritime language, “propeller” clearly refers to the rotating device, while related terms such as “rotor” are used more specifically for rotating assemblies in helicopters, turbines, and some fan systems. Propellers are central to the design of small aircraft, traditional boats, and older vehicles, and the word can also carry a technical or nautical tone when contrasted with more general terms such as “engine.”
A device with rotating blades that produces thrust in a fluid and propels an aircraft, ship, or other vehicle.
"The ship's propeller churned the water into a frothy wake."
The word is most common in aviation and nautical contexts; “rotor” may be preferred for a helicopter's rotating assembly or for a fan-like component.
A person or thing that drives an activity, organization, or undertaking forward.
"Her energetic leadership made her the propeller behind the campaign."
This is a figurative and relatively uncommon use.
The plural is formed by adding -s; the final -er is not doubled before the plural ending.
"The aircraft's two propellers turned slowly during the preflight inspection."
A propeller does not push air or water directly backward; its twisting blades create a rotating flow that pulls the fluid behind the aircraft or vessel, producing forward thrust.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does propeller come from?
“Propeller” entered English in the early 19th century, when mechanical propellers were developed for powered flight and water transport. Its name comes from the Latin verb propellere, meaning “to drive forward,” formed from pro-, meaning “forward,” and pellere, meaning “to drive” or “to push.” The same root appears in English words such as “propel,” “propulsion,” and “propulsive,” while “repellent” reflects the related idea of pushing back.
How propeller is actually used
In technical contexts, “propeller” usually means a screw-type marine or aircraft propeller. In figurative use, it can suggest the force or person that drives an undertaking, though this sense is less common and can sound slightly literary.
Easily confused with propeller
“Propellor” is an uncommon spelling variant of “propeller,” not a different meaning.