| MER | the smallest planet and the nearest to the sun |
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| MER | (Roman mythology) messenger of Jupiter and god of commerce |
| MER | barometer that shows pressure by the height of a column of mercury |
| MER | a primary cell consisting of a zinc anode and a cathode of mercury oxide and an electrolyte of potassium hydroxide |
| MER | a white poisonous soluble crystalline sublimate of mercury |
| MER | a fulminate that when dry explodes violently if struck or heated |
| MER | a toxic condition caused by ingesting or inhaling mercury |
| MER | a program of rocket-powered flights undertaken by US between 1961 and 1963 with the goal of putting a man in orbit around the earth |
| MER | thermometer consisting of mercury contained in a bulb at the bottom of a graduated sealed glass capillary tube marked in degrees Celsius or Fahrenheit |
| MER | a mercury thermometer designed to measure the temperature of the human body |
| MER | thermometer consisting of mercury contained in a bulb at the bottom of a graduated sealed glass capillary tube marked in degrees Celsius or Fahrenheit |
| MER | ultraviolet lamp that emits a strong bluish light (rich in ultraviolet radiation) as electric current passes through mercury vapor |