
1) Hyaline 2) Translucent substance 3) Transparent substance 
Found on 
https://www.crosswordclues.com/clue/hyalin

 Hyalin is a protein released from the cortical granules of a fertilized animal egg. The released hyalin modifies the extracellular matrix of the fertilized egg to block other sperm from binding to the egg, and is known as the slow-block to polyspermy. All animals have this slow-block mechanism. Hyalin is a large, acidic protein which aids in embry...
Found on 
http://en.wikipedia.org/wiki/Hyalin

A clear, homogeneous, structureless material found in the matrix of cartilage, vitreous body, mucin, and glycogen. It is a translucent albuminoid substance, one of the products of amyloid degeneration. ... (12 Dec 1998) ... 
Found on 
http://www.encyclo.co.uk/local/20973

(hi´ә-lin) a translucent albuminoid substance obtainable from the products of amyloid degeneration.
Found on 
http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: hī′ă-lin Definitions: 1. A clear, eosinophilic, homogeneous substance occurring in cellular degeneration; in arteriolar walls in arteriolar sclerosis and in glomerular tufts in diabetic glomerulosclerosis.
Found on 
http://www.medilexicon.com/medicaldictionary.php?t=41746
  No exact match found.