statoliths

/ˈstætəˌlɪθs/
noun
  1. Plural of statolith; small dense particles in cells that help organisms sense gravity.
    • Marine animals often have statoliths that help them navigate in dark waters.
    • Under a microscope, you can see the statoliths settling inside the sensory cells.
    • The statoliths in the plant's root cells moved to the lowest part of the cell when the pot was tilted.