Dictionaries typically contain word definitions, pronunciations, parts of speech, and sometimes usage examples or synonyms.
All oxides contain oxygen.
No, some do not contain oxygen at all
They all contain glycerol.
They all contain acid and bases
All organic compounds contain carbon.
Yes, all drugs contain chemicals.
All Berries contain some seeds.
They don't all contain cobalt, but some do.
All rocks contain the same thing. They all contain minerals, and some of these minerals are inorganic and crystalline, among others
All noble gasses contain electrons. In fact, all gasses contain electrons.
All materials and that includes minerals contain the elements. Sulfates contain sulfur and oxygen
Because it is a word and dictionaries contain words and their meanings.