† olive-plumn.Obsolete(a) a kind of small green plum;(b) the olive-like fruit (a drupe) of various tropical trees of the genus Cassine (formerly Elaeodendron) (family Celastraceae); (also) such a tree.
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1629 J. ParkinsonParadisi in Sole xiii. 578 The Olive plum is very like a greene oliue, both for colour and bignesse, and growing lowe on a small bushing tree.
1890 Cent. Dict.Olive-plum, any tree of the genus Elæodendron, or its fruit.