noun: (countable) Initialism of default mode network. [(neuroscience) A network of brain regions that are active when the individual is not focused on the outside world and the brain is at wakeful rest.]
noun: (uncountable) Initialism of dimethylnitrosamine. [(organic chemistry) The alkyl nitrosamine, (CH₃)₂N-N=O, found in tobacco smoke; it is carcinogenic]
