1. hydrogen fluoride

noun. A colorless poisonous corrosive liquid made by the action of sulphuric acid on calcium fluoride; solutions in water are hydrofluoric acid.
Synonyms
fluoride
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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. fluoride

noun. (ˈflʊˌraɪd, ˈflɔˌraɪd) A salt of hydrofluoric acid.
Synonyms
boron trifluoride stannous fluoride sulphur hexafluoride sulfur hexafluoride halide hydrogen fluoride
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