Oilless

Part of speech: adjective

Definitions

1. Describing a type of equipment that functions efficiently without petroleum lubricants, thus enhancing longevity and performance
2. Characterizing a device that eliminates the need for oil lubrication, leading to lower maintenance costs and improved reliability
3. Referring to a mechanism designed to operate without the use of oil for lubrication, thereby reducing wear and enhancing operational efficiency

Etymology: "Oilless" is a plain formation: the noun "oil" with the suffix "-less", meaning "without" or "lacking". Attaching "-less" to a noun to produce an adjective meaning "without that thing" is one of the most productive patterns in English, which is why "oilless" can be built on the spot for any machine or bearing that runs without lubricating oil. It belongs to the same family as "sleeveless", "pitiless" and "careless", all built the same way.