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AAS
AAU
AAUP
AAVE
AB (1)
AB (2)
Ab
ab-
ab initio
ab ovo
ABA
aba
abaca
abaci
aback
abacus
abada
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aa
aa [  ]


noun 
Definition:
 
volcanic rock: solidified lava with a rough jagged surface and sharp angular features
[Mid-19th century. < Hawaiian a-'a]
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