The term arachnid is from Greek and means spider. Arachnids have four pairs of legs. There are over 100,000 named species, including spiders, scorpions, harvestmen, ticks, and mites.

Adaptor pertains to a fitting that joins two different types of pipes together or a fitting that joins threaded with None threaded pipe (as in: female adaptor or male adaptor).

Alkali refers to an alkaline, or basic, chemical substance such as lime or lye. Generally present in fresh cement, concrete, or plaster.

Acrylic Resin refers to the thermoplastic polymers or co-polymers of acrylic acid, methacrylic acid, esters of these acids or acrylonitrile.

Appliances used in the home during the year, including those loaned to the householder for regular use.

Appearance is a term that can refer to:

1. How something look - a person can describe an animal's appearance using only his eyes; and

Acid refers to a substance that dissolves in water with the formation of hydrogen ions, contains hydrogen which may be replaced by metals to form salt, and/or is corrosive.

Appliance revolves around a piece of equipment, commonly powered by electricity, used to perform a particular energy-driven function.