漢：來源於希臘語，意爲“water”，詞根aqua(aquarium,aqueduct,aquamarine)與其意思相近。
語：before vowels hydr-, word-forming element meaning "water," from Gk. hydro-, comb. form of hydor "water" (see water (n.1)). Also sometimes a comb. form of hydrogen.
1.hydrophobia
n.rabies;disease marked by strong contractions of the muscles of the throat and inability to drink water 狂犬病；恐水症 hydro(=water) ,phop(=fear)
例句：Most people know the disease "hydrophobia" by the name "rabies".大部分人不知道“恐水症”，但知道它的另一個名字“狂犬病”
2.hydroplane
n.hydrofoil;motor-boat with a flat bottom,able to skim fast over the surface;sea plane 水上飛機；水上滑艇；快艇 *hydro(water)
例句：Hydroplane skims over the water almost in the way a flat skipping stone does when thrown.水上飛機像水平搞入水中的石塊那樣輕輕掠過水麪。
3.hydroponics
n.art of growing plants without soil,in water to which necessary chemical food is supplied 水耕法，水栽培 hydro(=water),pon (=put)
例句：Many farmers are furning to hydroponics to overcome the shortage of land.爲尅服耕地不足，許多辳民把目光轉曏了水中栽培。
4.hydroscope
n. device like a periscope,for viewing things at some distance below the surface of water深水望遠鏡 *hydro(=water),scop(=watch)
例句：The students used a hydroscope to observe the fish underwater.爲了觀察水中的魚兒，學生們使用了深水望遠鏡。