What does "cacodyl" mean?

The dimethylarsine radical (CH₃)₂As-

Cacodyl

Common synonyms include: cacodyl radical, arsenic group, arsenic-containing, arsenical, cacodyl group, dimethylarsinyl compound.

noun

noun ·Rare ·Advanced level

Noun

1
The dimethylarsine radical (CH₃)₂As- countable, uncountable
2
the univalent group derived from arsine wordnet
3
tetramethyldiarsine formally derived from two of these radicals; an evil-smelling liquid that spontaneously combusts in air countable, uncountable
4
a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air wordnet

Ancient Greek κακώδης (kakṓdēs, “evil-smelling”)