phosphine

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phos·phine

(fos'fēn, -fin),
A colorless poisonous war gas (PH3) with a characteristic garliclike odor; also the active agent in some rodenticides; formed in small quantities in the putrefaction of organic matter containing phosphorus.

phosphine

1. PH3, a toxic war gas called hydrogen phosphide.
2. a coal tar dye; called Philadelphia yellow.