Bdellium (dĕl'yŭm). A substance said to be found in the land of Havilah. Genesis 2:12. It is also said that the manna, like the hoar-frost, Exodus 16:14, or coriander-seed in size, was like bdellium in color. Numbers 11:7. Some believe this bdellium was a precious stone; some think it of vegetable origin, a kind of gum exuding from a tree. And this, indeed, is the ordinary meaning of that which ancient writers commonly call bdellium.