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arabinose
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arable
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aracari
arachidonic acid
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arachnid
arachniography
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arachidonic acid
ar·a·chi·don·ic ac·id [ àrrəki dònnik ássid ]


noun 
Definition:
 
fatty acid: an essential fatty acid found in most animal fats that is a precursor of prostaglandins
[< modern Latin arachid- "peanut" (< Greek arakhos "type of leguminous plant") + -one]
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