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aortic valve
aortography
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aoudad
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ap- (1)
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Apalachicola National Forest
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apatosaurus

a·pa·to·saur·us [ ə pàttə sáwrəss ] (plural a·pa·to·saur·us·es) or a·pa·to·saur [ ə páttə sàwr ] (plural a·pa·to·saurs)


noun 
Definition:
 
long-necked dinosaur: a large plant-eating dinosaur that lived in North America during the Jurassic period and had a small head, short front legs, and a long neck and tail. Genus Apatosaurus.
Former name  brontosaurus


[Late 19th century. < modern Latin< Greek apatē "deceit" + sauros "lizard"]
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