Glossary A

Aid telescope also known as low vision telescope is described as telescopic optical system, Galilean or Keplerian that forms a magnified retinal image of an object.

Autotrophy refers to a unique form of metabolism found only in bacteria. Inorganic compounds (e.g., NH₃, NO₂-, S2, and Fe2+) are oxidized directly (without using sunlight) to yield energy.

An attachment is pertaining to a file sent along with an e-mail. An attachment may be a picture or a document and has an extension which indicates which type of file it is, either rtf, jpg, jpeg.

Astronomical telescope makes reference to compound optical system, afocal in normal adjustment, consisting of a positive objective element or group and a positive ocular element or group forming a magnified, inverted image.

Ash yield pertains to the percentage of material remaining after a fuel is burned; that portion of a laboratory sample remaining after heating under standard conditions to constant weight; i.e., until all the combustible matter has been burned away.

Asbestos treatment is described as a treatment methods which include removal, encapsulation or sealing, and enclosure behind a permanent barrier.

Arrestor is the same as arrester, please see the term Arrester.

Alternative fuel vehicle (AFV) as defined by the Energy Policy Act, this refers to any dedicated non-petroleum-fuel or dual-fueled vehicle.