köken: Coined by Finnish physician and translator Wolmar Schildt in 1835 as a shortening (perhaps back-formation) of the dialectal terms ympyriäinen, ymmyrkäinen (“round”), ultimately from ympäri (“around”). The -ä- in ympäri- has turned into an -y- in these derivatives and thus in ympyrä as well, probably by influence from the preceding sounds (labial ymm-, ymp-). Arguably analyzable as ymp- + -yrä.