\Hy`a*lo*ne"ma\, n. [NL., fr. Gr. ? glass + ? a
thread.] (Zo["o]l.)
A genus of hexactinelline sponges, having a long stem
composed of very long, slender, transparent, siliceous fibres
twisted together like the strands of a color. The stem of the
Japanese species ({H. Sieboldii}), called {glass-rope}, has
long been in use as an ornament. See {Glass-rope}.