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Medical devices
Any instrument, appliance or machine that facilitates the prevention,diagnosis and treatment of illness, physical or mental injury, by a medical professional.
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asteroid belt
Astronomy; General astronomy
A region of space lying between Mars (1.5 AU) and Jupiter (5.2 AU), where the great majority of the asteroids are found. None of the belt asteroids have retrograde motion.
astrology
Astronomy; General astronomy
1) Divination using the positions of the planets, the Sun and the Moon as seen against the stars in the constellations of the zodiac - a "science" almost as old as homo sapiens. ...
astrometry
Astronomy; General astronomy
The branch of astronomy that deals with measuring the positions of celestial objects, especially stars. Astrometrists measure parallaxes and proper motions, which allow ...
astronomical horizon event
Astronomy; General astronomy
The time and azimuth at which a celestial body crosses the astronomical horizon of an oberver.
astronomical refraction
Astronomy; General astronomy
The change in direction of travel (bending) of a light ray as it passes obliquely through the atmosphere. As a result of refraction, the observed altitude of a celestial object is ...
astronomical unit (AU)
Astronomy; General astronomy
1) Mean distance between the Earth and the Sun: 1.495985 × 1011 m. 2) The AU is the preferred unit for distances within the solar system. Mercury, the innermost planet, lies on ...
