| astrometeorology | <study> The investigation of the relation between the sun, moon, and stars, and the weather. Astrometeorological, Astrometeorologist. (04 Mar 1998) |
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| astronauts | Members of spacecraft crew including those who travel in space, and those in training for space flight. (12 Dec 1998) |
| astronomer | 1. An astrologer. 2. One who is versed in astronomy; one who has a knowledge of the laws of the heavenly orbs, or the principles by which their motions are regulated, with their various phenomena. "An undevout astronomer is mad." (Young) See: Astronomy. Source: Websters Dictionary (01 Mar 1998) |
| astronomical | Of or pertaining to astronomy; in accordance with the methods or principles of astronomy. Astronom"ically, Astronomical clock. See Clock. Astronomical day. See Day. Astronomical fractions, Astronomical numbers. See Sexagesimal. Origin: L. Astronomicus, Gr., cf. F. Astronomique. Source: Websters Dictionary (01 Mar 1998) |
| astronomize | To study or to talk astronomy. "They astronomized in caves." (Sir T. Browne) Origin: Gr. Source: Websters Dictionary (01 Mar 1998) |
| astronomy | 1. Astrology. "Not from the stars do I my judgment pluck; And yet methinks I have astronomy." (Shak) 2. The science which treats of the celestial bodies, of their magnitudes, motions, distances, periods of revolution, eclipses, constitution, physical condition, and of the causes of their various phenomena. 3. A treatise on, or text-book of, the science. Physical astronomy. See Physical. Origin: OE. Astronomie, F. Astronomie, L. Astronomia, fr. Gr, fr. Astronomer; star + to distribute, regulate. See Star, and Nomad. Source: Websters Dictionary (01 Mar 1998) |
| astrophotography | The application of photography to the delineation of the sun, moon, and stars. Origin: Astro- + photography. Source: Websters Dictionary (01 Mar 1998) |
| astrophysical | Pertaining to the physics of astronomical science. Source: Websters Dictionary (01 Mar 1998) |
| astrophyton | <zoology> A genus of ophiurans having the arms much branched. Origin: Astro- + Gr. Fyton a plant. Source: Websters Dictionary (01 Mar 1998) |
| astroscope | <instrument> An old astronomical instrument, formed of two cones, on whose surface the constellations were delineated. Origin: Astro- + scope. Source: Websters Dictionary (01 Mar 1998) |
| astrosphere | A set of radiating microtubules extending outward from the cytocentrum and centrosphere of a dividing cell. Synonym: aster, attraction sphere, Lavdovsky's nucleoid, paranuclear body. Origin: G. Astron, star, + sphaira, ball (05 Mar 2000) |
| astrotactin | <protein> Neuronal surface glycoprotein with an apparent Mr 100 kD, thought to function as a neuron glia ligand in the binding of cerebellar granule neurons to astroglia. Expressed transiently in the cerebellum of the developing mammalian brain during periods of glia guided neuronal migration. (18 Nov 1997) |
| astrotheology | <study> Theology founded on observation or knowledge of the celestial bodies. (04 Mar 1998) |
| astroviridae | A family of RNA viruses with one genus: astrovirus. They cause gastroenteritis in humans and also infect other vertebrates. (12 Dec 1998) |
| astroviridae infections | Infections with astrovirus, causing gastroenteritis in human infants, calves, lambs, and piglets. (12 Dec 1998) |