Noun
small crystals of ice
Source: WordNetIce crystal growth Guar gum retards ice crystal growth nonspecifically by slowing mass transfer across the solid/liquid interface. Source: Internet
The droplet then grows by diffusion of water molecules in the air (vapor) onto the ice crystal surface where they are collected. Source: Internet
These "cages" are unstable when empty, collapsing into conventional ice crystal structure, but they are stabilised by the inclusion of the gas molecule within them. Source: Internet