The origin of the word Khartoum is uncertain. One theory argues that it is derived from Arabic khurṭūm (خرطوم, "trunk" or "hose"), probably referring to the narrow strip of land extending between the Blue and White Niles. Dinka scholars argue that the name derives from the Dinka words khar-tuom (Dinka-Bor dialect) or khier-tuom (as is the pronunciation in various Dinka Diaelects), translating to "place where rivers meet". This is supported by historical accounts which place the Dinka homeland in central Sudan (around present-day Khartoum) as recently as the 13th-17th centuries A.D. Captain J.A. Grant, who reached Khartoum in 1863 with Captain Speke's expedition, thought the name was most probably from the Arabic qurtum (قرطم, "safflower", i.e., Carthamus tinctorius), which was cultivated extensively in Egypt for its oil to be used as fuel. Some scholars speculate that the word derives from the Nubian word Agartum ("the abode of Atum"), the Nubian and Egyptian god of creation. Other Beja scholars suggest Khartoum is derived from the Beja word hartoom, "meeting". Additionally, the dream-interpreting magicians in Genesis 41:8 are referred to as חַרְטֻמֵּ֥י מצרים (Khartoumay Miṣrayim, "Magicians of Egypt"). There is some speculation that they learned their craft at an academy in the south of Egypt from which the city takes its name.