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Johnston's organ

[jon-stuh nz] /ˈdʒɒn stənz/
noun, Entomology
a sense organ in the second segment of the antenna of an insect, sensitive to movements of the antenna's flagellum, as when the insect is in flight.
Origin of Johnston's organ
named after Christopher Johnston (died 1891), American physician Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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