Definition of yellowtop 

1a : any of several goldenrods especially : early goldenrod sometimes plural but singular in construction

b : bitter clover

c : golden crownbeard

2 : any of several plant diseases characterized by yellowing of the upper foliage: such as

a : a disease of alfalfa of undetermined cause characterized by a pronounced yellowing of the upper portions of affected plants

b : a yellowing of alfalfa tops caused by the punctures of the potato leafhopper

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History and Etymology for yellowtop

yellow entry 1 + top

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by force of circumstances

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