a fluid substance, e.g. air, that has neither independent shape nor volume and tends to expand indefinitely
a gas or gaseous mixture used to produce general anaesthesia, as a fuel, etc
a substance, e.g. tear gas or mustard gas, that can be used to produce a poisonous, asphyxiating, or irritant atmosphere
NAmer, informal petrol
informal empty talk
informal an enjoyable or amusing person or thing
NAmer flatulence
[Latin gas, alteration of Greek chaos space, chaos; (sense 3) short for gasoline]