Hy`a*lo*ne"ma (?), n. [NL., fr. Gr. glass + a thread.] 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 (H. Sieboldii), called glass-rope, has long been in use as an ornament. See Glass-rope.
© Webster 1913.