WordReference Random House Unabridged Dictionary of American English © 2026
hy•dro•phane
(hī′drə fān′),USA pronunciation n.
hy•droph•a•nous
(hī drof′ə nəs),USA pronunciation adj.
- Mineralogy, Jewelrya partly translucent variety of opal, which becomes more translucent or transparent when immersed in water.
- 1775–85; hydro-1 + -phane