What does steam mean?
Steam most often refers to the vapor of water, particularly the white cloud seen rising from a kettle, a radiator, or a railway engine. Strictly speaking, the cloud visible to the eye consists of tiny droplets formed when invisible steam cools and condenses. The word also names the technology used to cook food, clean surfaces, and power machinery. In everyday conversation, steam can figuratively describe intense irritation: a person may be described as “steamed” or may “steam up” over an argument. Because steam is familiar from boiling, heating, and industrial history, it carries associations with heat, power, energy, and occasionally pressure or agitation. The term is used similarly in British and American English, with no major regional difference in its central meanings.
Water in its gaseous state, especially the vapor released by boiling water or the visible cloud produced as that vapor condenses into droplets.
"The pipes were covered in steam after the valve opened."
Usually uncountable when referring to water vapor or a general mass of vapor; plural forms are uncommon.
To produce or release steam; to cook or clean something using steam; or to move under steam power.
"The chef steamed the vegetables for five minutes."
Informally, “steam up” can mean to become angry or intensely excited.
Usually uncountable; the plural “steams” is uncommon and may refer to separate puffs or emissions of steam.
"Steams from the vents drifted across the platform."
Steam is the invisible gas that becomes a familiar white cloud when it cools into tiny droplets.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does steam come from?
English steam comes from Old English stēam, a word used for vapor, mist, or a heated exhalation. It developed from Proto-Germanic *stēamaz and has a close cognate in Dutch stoom. The word's long history reflects the longstanding use of steam in cooking, heating, and mechanical power, while later figurative senses developed from the idea of becoming heated or emotionally agitated.
Related word forms
How steam is actually used
In technical contexts, steam is the invisible gaseous form of water, while the familiar white cloud is technically a suspension of condensed droplets. In informal English, “steamed” or “steamed up” can mean annoyed or angry, and “full steam ahead” means proceeding with great energy or at full speed.
Easily confused with steam
Steam specifically refers to water in its gaseous state, whereas vapor can refer more broadly to a gas produced from a liquid.