Defn: A kind of coarse grass growing in wet grounds, and supposed to be injurious to sheep. [Prov. Eng.]

WATER TELESCOPE
Water telescope.

1. (Optics) A telescope in which the medium between the objective and the eye piece is water instead of air, used in some experiments in aberration.

2. A telescope devised for looking into a body of water.

WATER TENDER
Water tender. (Nav.)

Defn: In the United States navy, a first-class petty officer in charge in a fireroom. He "tends" water to the boilers, sees that fires are properly cleaned and stoked, etc. There is also a rating of chief water tender, who is a chief petty officer.

WATER THERMOMETER
Wa"ter ther*mom"e*ter. (Physics)

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

WATER THIEF
Wa"ter thief`.

Defn: A pirate. [R.] Shak.