teff 
(tĕf)
(tĕf)n.
1. An annual grass (Eragrostis tef) native to northeast Africa, having very small, edible seeds and cultivated as a cereal crop and for livestock forage.
2. The seeds of this plant, ground to produce flour.
[Amharic ṭef; see ṭḥp in the Appendix of Semitic roots.]