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aptitude
aptitude test
Apus
APWU
APY
apyrase
apyrexia
aq
aq.
AQ rate
Aqaba, Gulf of
Aqmola
aqua
aqua-
Aqua-Lung
aqua regia
aqua vitae
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apsidal
ap·si·dal [ ápsid'l ]


adjective 
Definition:
 
1. of apse: relating to the apse of a building
2. of apsis: relating to an apsis or the apsides of an orbit
[Mid-19th century. < Latin apsid-, stem of apsis (see apsis)]
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