Vitreous sponge
| See Glass-sponge. | |
| (Zool.) | any one of numerous species of siliceous sponges having, often fibrous, glassy spicules which are normally six-rayed; a hexactinellid sponge. See Venus's basket, under Venus. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.