trichite sheaf

from The Collaborative International Dictionary of English v.0.48

Trichite \Trich"ite\, n. [Gr. ?, ?, hair.]
   [1913 Webster]
   1. (Min.) A kind of crystallite resembling a bunch of hairs,
      common in obsidian. See Illust. of {Crystallite}.
      [1913 Webster]

   2. (Zool.) A delicate, hairlike siliceous spicule, found in
      certain sponges.
      [1913 Webster]

   {Trichite sheaf} (Zool.), one of the small sheaflike
      fascicles of slender setae characteristic of certain
      sponges. See Illust. under {Spicule}.
      [1913 Webster]