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rubescent
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rubidium-strontium dating
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rudbeckia

rud·beck·i·a [ rud békee ə, rood békee ə ] (plural rud·beck·i·as or rud·beck·i·a)


noun 
Definition:
 
plant with yellow-rayed flowers: a plant with alternate leaves and showy yellow flowers that have green or black centers. Native to: North America.  Genus Rudbeckia.

[Mid-19th century. < modern Latin, after Olof Rudbeck the elder (1630-1702) and the younger (1660-1740), Swedish botanists]
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