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icesolid substance produced by the freezing of water vapour or liquid water. at temperatures below 0° C (32° F), water vapour develops into frost at ground level and snowflakes (each of which consists of a single ice crystal) in clouds. below the same temperature, liquid water forms a solid, as, for . machinedevice, having a unique purpose, that augments or replaces human or animal effort for the accomplishment of physical tasks. this broadcategory encompasses such simple devices as the lever, wedge, wheel and axle, pulley, and screw (qq.v.; the five so-called simple machines) as well as such complex ... |
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