"cacodyl" in the noun sense
1. cacodyl, tetramethyldiarsine
a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups undergoes spontaneous combustion in dry air
2. cacodyl, cacodyl group, cacodyl radical, arsenic group
the univalent group derived from arsine
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License