Meaning of Johnston's organ

John'ston's or'gan

Pronunciation: ( jon'stunz), [key]
— Entomol. Entomol.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.