Source : Webster's Revised Unabridged Dictionary (1913)

Tilley \Til"ley\, n., or Tilley seed \Til"ley seed`\ (Bot.)
   The seeds of a small tree ({Croton Pavana}) common in the
   Malay Archipelago. These seeds furnish croton oil, like those
   of {Croton Tiglium}. [Written also {tilly}.]