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.
Full Definition of GREENHOUSE. 1. : a structure enclosed (as by glass) and used for the cultivation or protection of tender plants. 2. : a clear plastic shell (as a canopy) covering a section of an airplane; also: a compartment (as for a bombardier) enclosed by such a shell.