Wiktionary
phenyldichloroarsine
n. (context organic compound English) An organic arsenical vesicant and vomiting agent originally developed for use in chemical warfare.
Wikipedia
Phenyldichloroarsine
Phenyldichloroarsine, NATO abbreviation PD, is an organic arsenical vesicant and vomiting agent developed by Germany and France for use as a chemical warfare agent during World War I. The agent is known by multiple synonyms and is technically classified as a vesicant, or blister agent.
Phenyldichloroarsine (data page)
This page provides supplementary chemical data on Phenyldichloroarsine