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arithmetic logic unit
arithmetic mean
arithmetic progression
-arium
Ariz.
Arizona
Arizona cloudburst
Arjuna
Ark.
ark
Ark of the Covenant
Arkadelphia
Arkansas
Arkansas Post National Memorial
Arkansawyer
Arkhangelsk
arkose
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arista
a·ris·ta [ ə rístə ] (plural a·ris·tae [ ə rístay, ə rístee ])


noun 
Definition:
 
1. botany 
Same as  awn
2. bristle: a bristly part of the antennae of some flies
[Late 17th century. < Latin, "ear of grain"]
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