Aviation. the freezing of atmospheric moisture on the surface of an aircraft.
Ice Hockey. the act of a player shooting the puck from the defensive half of the rink over the opponent's goal line, but not into the goal, as a defensive maneuver to keep the puck out of the reach of attacking opponents, resulting in a penalty against the defensive team if the puck is then next touched by an opponent other than the goalkeeper.
O.E. is "ice," from P.Gmc. *isa- (cf. O.N. iss, O.Fris. is, Du. ijs, Ger. Eis), with no certain cognates beyond Gmc. Slang meaning "diamonds" is attested from 1906. Ice cream is first recorded 1688 (as iced cream); icing in the sugary sense is from 1769; ice cube first recorded 1929. To break the ice "to make the first opening to any attempt" is from 1590, metaphoric of making passages for boats by breaking up river ice though in modern use usually with implications of "cold reserve."