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.
WATER THERMOMETER
Meaning of WATER THERMOMETER in English
Webster English vocab. Английский словарь Webster. 2012