noun
whirligig beetle
Refers to insects of the family Gyrinidae, especially the Japanese whirligig beetle (Gyrinus japonicus). Known for swimming rapidly in circles on the water surface.
池でミズスマシがくるくる回っていた。
A whirligig beetle was spinning around on the pond.
noun
pond skater; water strider
Sometimes used loosely for pond skaters/water striders (アメンボ), but this is not the primary meaning. The standard term for pond skater is アメンボ.
See also: 水馬 (あめんぼ)
地域によっては、アメンボのことをミズスマシと呼ぶこともある。
In some regions, pond skaters are also called ミズスマシ.
Kanji spelling; rarely used in practice.
Variant kanji spelling.
Abbreviated kanji spelling.
アメンボ is the standard word for pond skater/water strider. ミズスマシ primarily means whirligig beetle, but can occasionally be used for pond skaters in some dialects or older usage.
Literally 'water clearer' or 'water purifier', from 水 (water) + 澄まし (clearing, making clear). The name likely refers to the insect's habit of swimming on the water surface, which may have been associated with clearing or skimming the water.