Compounds obtained from arsines $\ce{AsR3}$ by replacing one or more hydrogen atoms by a metal, e.g. $\ce{CaAsPh}$ calcium phenylarsenide.
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1319 [Terms] [Paper]