tidhar, from dahar "to revolve". Gesenius makes the oak, implying "duration". The shemen, in Nehemiah 8:15 is rather the olive or oil tree, as in Isaiah 41:19.
Bibliography Information Fausset, Andrew Robert M.A., D.D., "Definition for 'Pine' Fausset's Bible Dictionary". bible-history.com - Fausset's; 1878.