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arc second
arc sine
arc tangent
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arcade game
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archaebacteria
ar·chae·bac·te·ri·a [ rki bak tree ə ]


plural noun 
Definition:
 
microbiology 
Same as  archaea
[Late 20th century. Because believed to be of ancient origin]

ar·chae·bac·te·ri·al adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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