aster-yellows

aster yellows

noun Plant Pathology.
a dwarfing and yellowing of asters and various other plants, caused by a mycoplasma transmitted by a leafhopper.

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Aster-yellows is always a great word to know.
So is ninnyhammer. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
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