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A rare disease
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Manubrium
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IP address
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Symbiosis
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Aldolase
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Isomalt
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Physical model
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Sun-synchronous
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Ammon's horn
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Colour rendering index
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Anatidae
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Common channel signalling
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Dry ice
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Echolalia
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Criminal entomology
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Equilibrium
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Thoracic cavity
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Freon
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Mist
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Geometric coordinates
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Web-footed bird
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Echinoderm
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Scour pool
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Minimum viable population
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Z0
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Caffeine
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Low molecular weight heparin
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Osteoarthritis
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European sea sturgeon
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Yellow fever virus
Group of galaxies
A concentration of galaxies held together by gravitation. The term 'group' usually refers to small concentrations of a few dozen galaxies, while 'cluster' is used for larger concentrations.
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