til seed

from The Collaborative International Dictionary of English v.0.48

Til seed \Til seed\ (t[i^]l; t[=e]l).
   (a) The seed of sesame.
   (b) The seed of an African asteraceous plant ({Guizotia
       abyssinica}), yielding a bland fixed oil used in
       medicine.
       [Webster 1913 Suppl.]