Hy·a·lo·ne·ma n.  Zool. 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 (Hyalonema Sieboldii), called glass-rope, has long been in use as an ornament. See Glass-rope.
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