hydrogen
/ˈhaɪdrədʒən/noun
mass noun
- a colourless, odourless, highly flammable gas, the chemical element of atomic number 1. (Symbol: H)（化学元素）氢（符号： H）。
Hydrogen is the lightest of the chemical elements and has the simplest atomic structure, a single electron orbiting a nucleus consisting of a single proton. It is by far the commonest element in the universe, although not on the earth, where it occurs chiefly combined with oxygen as water.
派生词
hydrogenous
/haɪˈdrɒdʒɪnəs/ adjective词源
late 18th cent.: coined in French from Greek hudro- 'water'+-genēs （see -GEN）.