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conulariida
Science; General science
A group of extinct invertebrate organisms normally having an elongate, four-sided pyramidal exoskeleton of calcium phosphate composition. Due to poor preservation of key ...
symmetrodonta
Science; General science
A group of extinct mammals that range from the Late Triassic to Late Cretaceous. Their fossil remains have been found in Mesozoic deposits worldwide. These small insectivorous or ...
adenoviridae
Science; General science
A family of viral agents. They have been associated with pharyngoconjunctival fever (types 3, 4, and 7, in particular), acute respiratory disease (ARD), epidemic ...
retrovirus
Science; General science
A family of viruses distinguished by four characteristics: (1) genetic information is in the form of ribonucleic acid (RNA); (2) each single virus particle or virion ( illus. c , ...
fan
Science; General science
A fan moves gases by producing a low compression ratio, as in ventilation and pneumatic conveying of materials. The increase in density of the gas in passing through a fan is ...
lacquer
Science; General science
A fast-drying, hard, high-gloss surface coating. Lacquers are made by dissolving a cellulose derivative and other modifying materials in a solvent and adding pigment if desired.
clevis pin
Science; General science
A fastener with a head at one end and a hole at the other used to join a clevis to a rod. A clevis is a yoke with a hole formed or attached at one end of a rod (see illus .). ...
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