Meaning
(1) those of the `osher tree (`usar, Calotropis procera, described by Hasselquist (Travels, 1766)), found in abundance about Jericho and near the Dead Sea, which are filled with dust when they have been attacked by an insect, leaving the skin only entire, and of a beautiful color. Tristram describes the fruit as being "as large as an apple of average size, of a bright yellow color, hanging three or four together close to the stem"; or as suggested by Tristram
(2) those of the wild colocynth; the fruit is fair of aspect with a pulp which dries up into a bitter powder (EB, article "Sodom," col. 4669, note 2). This colocynth is supposed to be the "wild vine" mentioned 2Ki 4:39. The "vine of Sodom" of De 32:32 has been supposed to bear the "Dead Sea fruit"; but most modern writers regard the passage as figurative.
W. L. Walker