atmo-, atm- +

1. The noises in a radio receiver or randomly distributed white spots or bands on the screen of a television receiver: Atmospherics are caused by interferences from natural electromagnetic disturbances in the atmosphere and the study of such phenomena.
2. The moods or atmospheres; the ambiances: Fortunately, the atmospherics of the conference were friendlier than we had anticipated.
3. Unusual conditions in the atmosphere: Atmospherics are those caused by lightning, or the continuous short, sharp noises produced by a radio during these conditions.

Electromagnetic radiation produced by natural phenomenam such as lightning: Atmospherics are disturbances of electrical origin causing interference with communication in wireless telegraphy, television, etc.

Sferics are atmospheric conditions caused by electromagnetic upheavals, especially as they affect radio transmission

An optical system used to simulate images of atmospheric phenomena: An atmospherium, for example, projects cloud formations and storms on the inside of a dome.

An atmospherium is also the term for the building in which this projection system is used.

The oxygenation of venous blood: Atmospherization can also be described as the transformation or conversion of of venous blood into arterial blood.

The scientific investigation or treatise of the atmosphere: Atmospherology is the systematic study of the phenomena of the atmosphere of a planet, a satellite, or of the sun.

More specifically, atmospherology is the examination or research of the Earth's atmospher, as in meteorology.

In ornithology, any ossified tube conveying air to the hollow bones in birds: Jane read in her biology book that an atmosteon pertained to an "air-bone", or a membranous tube for the scleroskeletal ossification of birds.

Therapeutic use of medicated vapors: Dr. Thompson told Mrs. Smith that atmotherapy, using steam or vapor, would be good to reduce her respiratory rate.

Concerning the region of space outside the atmosphere: The exoatmospheric area is the uppermost layer where the atmosphere thins out and connects with outer space. It exists immediately above the thermosphere.

Referring to something that doesn't convey a suggestion of tone or mood: When Jane entered the new house, it had an unatmospheric feeling about it and failed to evoke any association with her past or present way of life.