| arugula | (noun) erect European annual often grown as a salad crop to be harvested when young and tender | Synonyms: Eruca sativa, Eruca vesicaria sativa, garden rocket, rocket, rocket salad, roquette |
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| arui | (noun) wild sheep of northern Africa | Synonyms: Ammotragus lervia, aoudad, audad, Barbary sheep, maned sheep |
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| arum | (noun) any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe | Synonyms: aroid |
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| (noun) starch resembling sago that is obtained from cuckoopint root | - |