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Animals

Any living creature of the Kingdom Animalia constituting multi-celled organisms as well as single-celled organisms lacking chlorophyll and having the ability for spontaneous movement, such as protozoans.

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arcsecond

Astronomy; General astronomy

One sixtieth of an arcminute, or 1/3600 of a degree.

argon (Ar, 1S0 in ground state)

Astronomy; General astronomy

colourless, odourless gas comprising 1% of the atmosphere

argument of the perihelion (ω, longitude of the perihelion)

Astronomy; General astronomy

Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.

array telescope

Astronomy; General astronomy

a telescope composed of an array of separete individual elements acting in concert

arsenic (As, 4S3/2 in ground state)

Astronomy; General astronomy

a metalloid element with two main forms, grey α arsenic and β arsenic

artifact

Astronomy; General astronomy

an object made by humans

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