What is "dimethylmercury"

n. (context organic compound English) The organometallic compound of mercury (CH₃)₂Hg that is a dangerous neurotoxin

Dimethylmercury (( C H) Hg) is an organomercury compound. This colorless liquid is one of the strongest known neurotoxins. It is described as having a slightly sweet smell, although inhaling enough vapor to detect its odor would be hazardous.