1.  The white of egg. It is used as a size or a glaze in bookbinding, for pastry, etc. [1913 Webster]

2.  Any viscous, transparent substance, resembling the white of an egg. [1913 Webster]

3.  A broadsword fixed on a pike; a kind of halberd. [1913 Webster]

   To smear with the white of an egg. [1913 Webster]

glair, n. (also glaire)
1 white of egg.
2 an adhesive preparation made from this, used in bookbinding etc.

Derivative:
glaireous adj. glairy adj.

Etymology:
ME f. OF glaire, ult. f. L clara fem. of clarus clear

N  semiliquidity, stickiness, viscidity, viscosity, gummosity, glutinosity, mucosity, spissitude, crassitude, lentor, adhesiveness, inspissation, incrassation, thickening, jelly, mucilage, gelatin, gluten, carlock, fish glue, ichthyocol, ichthycolla, isinglass, mucus, phlegm, goo, pituite, lava, glair, starch, gluten, albumen, milk, cream, protein, treacle, gum, size, glue (tenacity), wax, beeswax, emulsion, soup, squash, mud, slush, slime, ooze, moisture, marsh, semifluid, semiliquid, tremellose, half melted, half frozen, milky, muddy, lacteal, lactean, lacteous, lactescent, lactiferous, emulsive, curdled, thick, succulent, uliginous, gelatinous, albuminous, mucilaginous, glutinous, glutenous, gelatin, mastic, amylaceous, ropy, clammy, clotted, viscid, viscous, sticky, tacky, gooey, slab, slabby, lentous, pituitous, mucid, muculent, mucous, gummy.