noun
fishing spider; Dolomedes spp.
Refers to spiders of the genus Dolomedes, often found near water. Usually written in kana.
池のほとりでハシリグモを見つけた。
I found a fishing spider by the pond.
Compound of 走り (hashiri, 'running') + 蜘蛛 (kumo, 'spider'), referring to its quick movements. The exact derivation is uncertain.