(1):

(n.) A poetic term for the sea or the atmosphere.

(2):

(a.) Glassy; resembling glass; consisting of glass; transparent, like crystal.

(3):

(n.) The main constituent of the walls of hydatid cysts; a nitrogenous body, which, by decomposition, yields a dextrogyrate sugar, susceptible of alcoholic fermentation.

(4):

(n.) The pellucid substance, present in cells in process of development, from which, according to some embryologists, the cell nucleous originates.