pyörivillä

Pyörivillä is a Finnish word form derived from the verb pyöriä ("to spin, revolve") and the adjectival participle pyörivä ("rotating, revolving"). Grammatically it appears when the participial adjective is inflected in the adessive plural (pyörivillä), a case often used to indicate location, instrumentality or accompaniment. In literal translation it commonly corresponds to phrases like "on/at/with the rotating (ones)" or "by means of rotating [things]".

Usage typically describes objects or components that are in a state of rotation, for example in technical, mechanical or descriptive contexts: pyörivillä osilla ("on the rotating parts"), pyörivillä terillä leikataan ("it is cut with rotating blades"). As a modifier it agrees in number and case with the noun it qualifies and follows standard Finnish adjective inflection patterns (related forms include pyörivä, pyörivät, pyörivän, pyöriville).

Etymology traces to Finnish pyöri- and ultimately to Uralic roots connected with turning and circular motion; it is cognate with words such as pyörä ("wheel"). The form pyörivillä is productive in contemporary Finnish and appears both in technical writing and everyday speech when specifying instruments, locations or conditions involving rotation. Variants and related expressions convey similar meanings by using different cases or constructions (e.g., pyörivät, pyörivässä).