قاموس اللغة الإنجليزية

A thermometer filled with water instead of mercury, for ascertaining the precise temperature at which water attains its maximum density. This is about 39¡ Fahr., or 4¡ Centigrade; and from that point down to 32¡ Fahr., or 0¡ Centigrade, or the freezing point, it expands.