Hazardous Materials Identification System. The Hazardous Materials Identification System (HMIS) is a numerical hazard rating that incorporates the use of labels with color developed by the American Coatings Association as a compliance aid for the OSHA Hazard Communication Standard. 1 HMIS Color Bar.
Definition of greenhouse gas. : any of various gaseous compounds (such as carbon dioxide) that absorb infrared radiation, trap heat in the atmosphere, and contribute to the greenhouse effect.
greenhouse definition: The definition of a greenhouse is a building made of glass panes in which heat and humidity can be regulated in order to grow plants. (noun) An example of a greenhouse is where vegetables can be grown when the outside weather is bel...