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streamline.

A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow.

10 characters2 syllables approx.English language

Meaning & usage

noun/ˈstriːmlaɪn/

A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow.
On a weather chart, a line that is tangent to the flow of the wind.

Where this word comes from

Etymology tree Proto-Indo-European *ser-? Proto-Indo-European *srew-der. Proto-Indo-European *srow-mo-s Proto-Germanic *straumaz Proto-West Germanic *straum Old English strēam Middle English strem English stream Proto-Indo-European *līno-der.? Proto-Germanic *līną Proto-Germanic *līnǭ Proto-West Germanic *līnā Old English līne Middle English line English line English streamline From stream + line.

verb/ˈstriːmlaɪn/

To design and construct the contours of a vehicle etc. so as to offer the least resistance to its flow through a fluid.
transitive
To simplify or organize a process in order to increase its efficiency.
broadly · transitive
To modernize.
transitive

Where this word comes from

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.