The Collaborative International Dictionary of English v.0.48:

Tiglic \Tig"lic\, a. (Chem.)
   Of, pertaining to, or designating, an acid, C4H7CO2H
   (called also methyl crotonic acid), homologous with crotonic
   acid, and obtained from croton oil (from Croton Tiglium) as
   a white crystalline substance.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Croton \Cro"ton\ (kr?"t?n), n. [Gr. ????, prop., a tick, which
   the seed of the croton resembles.] (Bot.)
   A genus of euphorbiaceous plants belonging to tropical
   countries.
   [1913 Webster]

   Croton oil (Med.), a viscid, acrid, brownish yellow oil
      obtained from the seeds of Croton Tiglium, a small tree
      of the East Indies. It is a most powerful drastic
      cathartic, and is used externally as a pustulant.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Croton tiglium
    n 1: tropical Asiatic shrub; source of croton oil [syn:
         croton, Croton tiglium]