1. hydrogen ion

noun. A positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus.
Synonyms
hydrogen atom cation proton

2. hydrogen-bomb

verb. Attack with a hydrogen bomb.
Synonyms
bombard bomb
Antonyms
defend dumb bomb smart bomb

3. hydrogen

noun. (ˈhaɪdrədʒən) A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe.
Synonyms
atomic number 1 chemical element gas tritium H H2O water element
Antonyms
understate unleaded gasoline leaded gasoline defend fresh water
Etymology
hydrogen (English)
hydrogène (French)
-gène (French)
hydro- (French)
ὑδρο- (Ancient Greek (to 1453))

4. ion

noun. (ˈaɪˌɑːn, ˈaɪən) A particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons.
Synonyms
anion particle subatomic particle cation
Etymology
ion (English)
ἰόν (Ancient Greek (to 1453))
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