glassy; resembling glass; consisting of glass; transparent, like crystal.-a poetic term for the sea or the atmosphere.-the pellucid substance, present in cells in process of development, from which, according to some embryologists, the cell nucleous originates.-the main constituent of the walls of hydatid cysts; a nitrogenous body, which, by decomposition, yields a dextrogyrate sugar, susceptible of alcoholic fermentation.