Hydroscope
Pronunciation : Hy"dro*scope
Part of Speech : n.
Etymology : [Hydro-, 1 + -scope.]
Definition : 1. An instrument designed to mark the presence of water, especially in air. Weale.
2. A kind of water clock, used anciently for measuring time, the water tricking from an orifice at the end of a graduated tube.
Source : Webster's Unabridged Dictionary, 1913