(pl. gases 或 <主美> gasses) ［mass noun］
1
- an air-like fluid substance which expands freely to fill any space available, irrespective of its quantity气, 气体：
hot balls of gas that become stars
演变成恒星的热气团
count noun poisonous gases.有毒气体。
1.1
- Physics a substance of this type that cannot be liquefied by the application of pressure alone【物理】仅靠压力无法液化的气体物质。比较 VAPOUR.
1.2
- a flammable substance of this type used as a fuel可燃气体, 气体燃料。
1.3
- a gaseous anaesthetic such as nitrous oxide, used in dentistry麻醉气（如用于牙科的氧化亚氮）。
1.4
- gas or vapour used as a poisonous agent to kill or disable an enemy in warfare（战争中使敌人丧生或致残的）毒气。
1.5
- chiefly N. Amer. gas generated in the alimentary canal; flatulence〈主北美〉胃气, 肠气;
1.6
- Mining an explosive mixture of firedamp with air【矿】瓦斯。
3
a gas
informal a person or thing that is entertaining or amusing〈非正式〉令人愉快的人（或事）：the party would be a gas.
这个聚会会很好玩的。
3.1
- mass noun Irish enjoyment, amusement, or fun〈爱尔兰〉快乐; 娱乐; 乐趣：
it was great gas in the club last night.
昨晚在俱乐部玩得太高兴了。
(gases, gassed, gassing)with obj.
1
- attack with or expose to gas用（或受）毒气袭击：
my son was gassed at Verdun.
我儿子在凡尔登受到毒气伤害。
1.1
- kill by exposure to gas用（毒气）毒死：
a mother and her children were found gassed in their car.
人们发现一位母亲和她的孩子在他们的汽车内被毒气毒死了。
1.2
- no obj.(of a storage battery or dry cell) give off gas（蓄电池, 干电池）放出气体。
2
- N. Amer. informal fill the tank of (a motor vehicle) with petrol〈北美, 非正式〉（将汽车油箱）加满汽油：
after gassing up the car, he went into the restaurant.
他给汽车加油之后就去了饭店。
3
- no obj. informal talk, especially excessively, idly, or boastfully〈非正式〉啰嗦, 闲谈; 吹牛：
I thought you'd never stop gassing.
我看你总在吹牛。
- Irish informal very amusing or entertaining〈爱尔兰, 非正式〉非常有趣的; 逗乐的：
Ruthie, that's gas - you're a gem.
露茜, 太有趣了——你真了不起。
短语
run out of gas
- N. Amer. informal run out of energy; lose momentum〈北美, 非正式〉没有能量; 缺少动力。
step on the gas
- N. Amer. informal press on the accelerator to make a car go faster〈北美, 非正式〉踩油门加速。
词源
mid 17th cent.: invented by J. B. van Helmont （1577-1644）, Belgian chemist, to denote an occult principle which he believed to exist in all matter; suggested by Greek khaos 'chaos', with Dutch g representing Greek kh.