The origin of the name "Baobab" is to be found in the Egyptian name "Bu hobab", given to it by Cairo merchants who traded in exotic products in that city during the 16th century. Dr. David Livingstone referred to the Baobab as "that giant upturned carrot", which is an apt description of the tree, as the enormously thick trunk and the comparatively slender branches create that image.
It also reminds one of the root-system of a tree, which gave rise to the colloquial term of the "upside-down tree".
The average stem diameter of a large Baobab is about 5m, but specimens with a diameter of up to 9m are not uncommon. One of the largest Baobabs in Southern Africa has a circumference of 46,8m (152 ft).
From the Botswana Tourism site... www.botswanatourism.co.bw