The Collaborative International Dictionary of English v.0.48:

Hyaline \Hy"a*line\, a. [L. hyalinus, Gr. ?, fr. "y`alos glass:
   cf. F. hyalin.]
   Glassy; resembling glass; consisting of glass; transparent,
   like crystal. "Hyaline spaces." --Carpenter.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hyaline \Hy"a*line\, n.
   1. A poetic term for the sea or the atmosphere. "The clear
      hyaline, the glassy sea." --Milton.
      [1913 Webster]

            Our blood runs amazed 'neath the calm hyaline.
                                                  --Mrs.
                                                  Browning.
      [1913 Webster]

   2. (Biol.) The pellucid substance, present in cells in
      process of development, from which, according to some
      embryologists, the cell nucleus originates.
      [1913 Webster]

   3. (Physiol. Chem.) The main constituent of the walls of
      hydatid cysts; a nitrogenous body, which, by
      decomposition, yields a dextrogyrate sugar, susceptible of
      alcoholic fermentation. --Gamgee.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hyaline
    adj 1: resembling glass in transparency or translucency; "the
           morning is as clear as diamond or as hyaline"-Sacheverell
           Sitwell [syn: hyaline, hyaloid]
    n 1: a glassy translucent substance that occurs in hyaline
         cartilage or in certain skin conditions [syn: hyaline,
         hyalin]