[1] : WordNet (r) 2.0

gas helmet
     n : a protective mask with a filter; protects the face and lungs
         against poisonous gases syn: gasmask, respirator
see also:
gasmask respirator 

Gas >> G Words
Gas, definition of term: Gas
gas_pag1.html

Gas Stove >> G Words
Gas Stove, definition of term: Gas Stove
gas+stove_pag1.html

Gas Turbine >> G Words
Gas Turbine, definition of term: Gas Turbine
gas+turbine_pag1.html

Gas Station >> G Words
Gas Station, definition of term: Gas Station
gas+station_pag1.html

Gas Jet >> G Words
Gas Jet, definition of term: Gas Jet
gas+jet_pag1.html

Gas Chamber >> G Words
Gas Chamber, definition of term: Gas Chamber
gas+chamber_pag1.html

Coal Gas >> C Words
Coal Gas, definition of term: Coal Gas
coal+gas_pag1.html