This is an article from the public domain Easton's Bible Dictionary, originally published in 1897. This article is written from a nineteenth century Christian viewpoint, and may not reflect modern opinions or recent discoveries in Biblical scholarship. Please help the Wikipedia by bringing this article up to date.

Oil-tree - (Isa. 41:19; R.V. marg., "oleaster"), Heb. 'etz shemen, rendered "olive tree" in 1 Kings 6:23, 31, 32, 33 (R.V., "olive wood") and "pine branches" in Neh. 8:15 (R.V., "branches of wild olive"), was some tree distinct from the olive. It was probably the oleaster (Elaeagnus angustifolius), which grows abundantly in almost all parts of Palestine, especially about Hebron and Samaria. "It has a fine hard wood," says Tristram, "and yields an inferior oil, but it has no relationship to the olive, which, however, it resembles in general appearance."

From Easton's Bible Dictionary (1897)