'Ivory' in the Bible

Moreover the king made a great throne of ivory, and overlaid it with the finest gold.

For the king had at sea a navy of Tarshish with the navy of Hiram: once every three years came the navy of Tarshish, bringing gold, and silver, ivory, and apes, and peacocks.

Now the rest of the acts of Ahab, and all that he did, and the ivory house which he built, and all the cities that he built, are they not written in the book of the chronicles of the kings of Israel?