noun
Asian poison ivy
A plant (Rhus ambigua) found in East Asia, similar to North American poison ivy; contact can cause a rash.
山でツタウルシに触れてかぶれてしまった。
I touched some Asian poison ivy in the mountains and got a rash.
ウルシ refers to the lacquer tree (Toxicodendron vernicifluum) or its sap; ツタウルシ is a different species that causes skin irritation.
Compound of 蔦 (つた, ivy) and 漆 (うるし, lacquer), referring to its ivy-like growth and irritant sap similar to lacquer.