The definition of a doum is a palm tree in Africa that creates a fruit that looks and tastes like gingerbread, and is also known as a gingerbread palm or Hyphaene thebaica.(noun)
An example of a doum is a palm tree you might find in Eritrea.
See doum in Webster's New World College Dictionary
Origin: Fr < Ar dawm
See doum in American Heritage Dictionary 4
Origin: , probably from Arabic dialectal dōm; see doom palm.